Trying to fix citations again

docs/physics/tardisgamma/opacities.ipynb

@@ -63,7 +63,7 @@
     "Pair Creation is dominant when the energy of the $\\gamma$-ray is greater than or equal to $2m_e c^2$.\n",
     "It occurs when a $\\gamma$-ray interacts with an atomic nucleus and creates an electron-positron pair. The positron forms a bound-state with an electron called positronium which decay into two photons at 0.511 MeV or three photons. \n",
     "The photon packet keeps its energy but is sent into a new direction.\n",
-    "The pair-production coefficients ($cm^{-1}$) are <strong data-cite=\"@Hubbell1969\">[]</strong> <strong data-cite=\"@Ambwani1988\">[]</strong>:\n",
+    "The pair-production coefficients ($cm^{-1}$) are :cite:`Hubbell1969`  {cite}`Ambwani1988`:\n",
     "\n",
     "$$\n",
     "\\alpha_{pp}(1.5 < h\\nu < 1.022) = \\rho \\left[ \\frac{Z_{\\text{Si}}^2}{m_{\\text{Si}}} (1 - X_{\\text{IGE}}) + \\frac{Z_{\\text{Fe}}^2}{m_{\\text{Fe}}} X_{\\text{IGE}} \\right] 1.0063 (h\\nu - 1.022) \\times 10^{-27}\n",