diff --git a/bibtex-ignore.txt b/bibtex-ignore.txt
index 99cf6610..247262f6 100644
--- a/bibtex-ignore.txt
+++ b/bibtex-ignore.txt
@@ -1,4 +1,3 @@
-Warning--empty publisher in DGT:EMSE21
 Warning--can't use both volume and number fields in LMY:AAAI21
 Warning--can't use both volume and number fields in DPV:AAAI20
 Warning--there's a number but no volume in BSM+:OOPSLA24
diff --git a/literature.bib b/literature.bib
index 87d37ed3..4bc3764f 100644
--- a/literature.bib
+++ b/literature.bib
@@ -2426,6 +2426,21 @@ @article{BRSS:COLA22
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2021 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{ESP:PLDI21,
+    author = {Erdweg, Sebastian and Szab\'{o}, Tam\'{a}s and Pacak, Andr\'{e}},
+    title = {{Concise, Type-Safe, and Efficient Structural Diffing}},
+    year = 2021,
+    isbn = {9781450383912},
+    publisher = ACM,
+    address = NY,
+    doi = {10.1145/3453483.3454052},
+    booktitle = PLDI,
+    pages = {406--419},
+    numpages = {14},
+    keywords = {tree diffing, incremental computing},
+    location = {Virtual, Canada},
+}
+
 @book{BHvMW21,
 	author = {Biere, Armin and Heule, Marijn and van Maaren, Hans and Walsh, Tony},
 	title = {{Handbook of Satisfiability}},
@@ -3240,9 +3255,9 @@ @inproceedings{KTSB:ICSE21
 }
 
 @book{DGT:EMSE21,
-	missing = NoPublisher,
 	editor = {Laurence Duchien and Paul Gr{\"{u}}nbacher and Thomas Th{\"{u}}m},
 	title = {{Special Issue on Configurable Systems in Empirical Software Engineering (EMSE)}},
+	publisher = Springer,
 	volume = {26},
 	doi = {10.1007/s10664-021-09964-6},
 	tt-tags = {Editorial},
@@ -4423,6 +4438,21 @@ @inproceedings{STS:VaMoS20
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{SMK+:SPLC19,
+  author = {Daniel Str{\"{u}}ber and Mukelabai Mukelabai and Jacob Kr{\"{u}}ger and Stefan Fischer and Lukas Linsbauer and Jabier Martinez and Thorsten Berger},
+  title = {{Facing the Truth: Benchmarking the Techniques for the Evolution of Variant-Rich Systems}},
+  booktitle = SPLC,
+  year = 2019,
+  publisher = ACM,
+  address = NY,
+  pages = {177--188},
+  numpages = {12},
+  doi = {10.1145/3336294.3336302},
+  isbn = {9781450371384},
+  keywords = {software variability, software evolution, product lines, benchmark},
+  location = Paris
+}
+
 @inproceedings{BH:POS19,
 	title     = {{The Effect of Scrambling CNFs}},
 	author    = {Biere, Armin and Heule, Marijn},
@@ -5647,6 +5677,21 @@ @article{BCKW:Dagstuhl19
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2018 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{KES:ICSEC18,
+  author = {Christian Kr{\"{o}}her and Sascha El{-}Sharkawy and Klaus Schmid},
+  title = {{KernelHaven: An Experimentation Workbench for Analyzing Software Product Lines}},
+  booktitle = ICSEC,
+  pages = {73--76},
+  numpages = {4},
+  publisher = ACM,
+  address = NY,
+  year = 2018,
+  keywords = {empirical software engineering, software product line analysis, static analysis, variability extraction},
+  doi = {10.1145/3183440.3183480},
+  isbn = {9781450356633},
+  location = Gothenburg
+}
+
 @article{A:SZJ18,
 	title     = {{Internal, External, and Ecological Validity in Research Design, Conduct, and Evaluation}},
 	author    = {Andrade, Chittaranjan},
@@ -6613,7 +6658,7 @@ @article{HLB+:AIJ17
 	pages   = {1--25},
 	year    = 2017,
 	issn    = {0004-3702},
-	doi     = {j.artint.2016.09.006}
+	doi     = {10.1016/J.ARTINT.2016.09.006}
 }
 
 @inproceedings{SKFD:GCPR17,
@@ -11959,6 +12004,18 @@ @article{TKB+:SCP14
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2013 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@article{LSLZ:STVR13,
+  title = {{A Survey of Code-Based Change Impact Analysis Techniques}},
+  author = {Li, Bixin and Sun, Xiaobing and Leung, Hareton and Zhang, Sai},
+  journal = STVR,
+  volume = {23},
+  number = {8},
+  pages = {613--646},
+  doi = {10.1002/STVR.1475},
+  year = 2013,
+  publisher = Wiley
+}
+
 @InProceedings{HJB:CPAIOR13,
 	author = {Heule, Marijn J. H. and J{\"a}rvisalo, Matti and Biere, Armin},
 	title = {{Revisiting Hyper Binary Resolution}},
@@ -15537,6 +15594,19 @@ @inproceedings{STKS:VaMoS12
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2011 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{NNNN:ASE11,
+  author = {Hoan Anh Nguyen and Tung Thanh Nguyen and Hung Viet Nguyen and Nguyen, Tien N.},
+  title = {{iDiff: Interaction-Based Program Differencing Tool}},
+  year = 2011,
+  isbn = {9781457716386},
+  publisher = IEEE,
+  address = Washington,
+  doi = {10.1109/ASE.2011.6100128},
+  booktitle = ASE,
+  pages = {572--575},
+  numpages = {4},
+}
+
 @misc{C11,
 	author = {Colbourn, Charles J},
 	title = {{Covering Arrays and Hash Families}},
@@ -17942,6 +18012,18 @@ @article{BSRC10
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2009 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@article{GFP:Software09,
+  title = {{Change Analysis With Evolizer and ChangeDistiller}},
+  author = {Gall, Harald C. and Fluri, Beat and Pinzger, Martin},
+  journal = Software,
+  volume = {26},
+  number = {1},
+  pages = {26--33},
+  doi = {10.1109/MS.2009.6},
+  year = 2009,
+  publisher = IEEE,
+}
+
 @book{K09,
 	author = {Knuth, Donald E.},
 	title = {{The Art of Computer Programming, Volume 4, Fascicle 1: Bitwise Tricks \& Techniques; Binary Decision Diagrams}},
@@ -19637,6 +19719,17 @@ @inproceedings{AL08
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2007 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@article{LGJ:EJIS07,
+  title = {{DSMDiff: A Differentiation Tool for Domain-Specific Models}},
+  author = {Lin, Yuehua and Gray, Jeff and Jouault, Fr{\'e}d{\'e}ric},
+  journal = EJIS,
+  volume = {16},
+  number = {4},
+  pages = {349--361},
+  year = 2007,
+  publisher=TaylorFrancis
+}
+
 @inproceedings{DGK:MILCOM07,
   author    = {Demers, Stephanie and Gopalakrishnan, Praveen and Kant, Latha},
   booktitle = MILCOM,
@@ -19669,7 +19762,7 @@ @inproceedings{ADT:ICWE07
     publisher = Springer,
     address = BerlinHeidelberg,
     year = 2007,
-    doi = {10.1007/978-3-540-73597-7\_39}
+    doi = {10.1007/978-3-540-73597-7_39}
 }
 
 @article{AOH:ASE07,
@@ -22413,6 +22506,28 @@ @article{BSR04
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2003 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{WDC:ICDE03,
+  title = {{X-Diff: An Effective Change Detection Algorithm for XML Documents}},
+  author = {Wang, Yuan and DeWitt, David J. and Cai, Jin{-}yi},
+  booktitle = ICDE,
+  publisher = IEEE,
+  address = LosAlamitos,
+  doi = {10.1109/ICDE.2003.1260818},
+  pages = {519--530},
+  year = 2003,
+}
+
+@inproceedings{FPG:ICSM03,
+  author = {Michael Fischer and Martin Pinzger and Harald C. Gall},
+  title = {{Populating a Release History Database from Version Control and Bug Tracking Systems}},
+  booktitle = ICSM,
+  pages = {23},
+  publisher = IEEE,
+  address = Washington,
+  year = 2003,
+  doi = {10.1109/ICSM.2003.1235403}
+}
+
 @book{F03,
 	title = {{UML Distilled: A Brief Guide to the Standard Object Modeling Language (3rd Edition)}},
 	author = {Fowler, Martin},