Update biblio (#55)

docs/source/research.bib

@@ -9,29 +9,47 @@
         url = {https://arxiv.org/abs/1907.01245}
 }
 
-@article{Dash2019May,
-        author = {Dash, Monika and Feldt, Jonas and Moroni, Saverio and Scemama, Anthony and Filippi, Claudia},
-        title = {{Excited states with selected CI-QMC: chemically accurate excitation energies and geometries}},
-        journal = {arXiv},
-        year = {2019},
-        month = {May},
-        eprint = {1905.06737},
-        url = {https://arxiv.org/abs/1905.06737}
+
+@article{Burton_2019,
+        doi = {10.1021/acs.jctc.9b00441},
+        url = {https://doi.org/10.1021%2Facs.jctc.9b00441},
+        year = 2019,
+        month = {aug},
+        publisher = {American Chemical Society ({ACS})},
+        author = {Hugh G. A. Burton and Alex J.W. Thom},
+        title = {A General Approach for Multireference Ground and Excited States using Non-Orthogonal Configuration Interaction},
+        journal = {Journal of Chemical Theory and Computation}
 }
 
-@article{Burton2019May,
-        author = {Burton, Hugh G. A. and Thom, Alex J. W.},
-        title = {{A General Approach for Multireference Ground and Excited States using Non-Orthogonal Configuration Interaction}},
-        journal = {arXiv},
-        year = {2019},
-        month = {May},
-        eprint = {1905.02626},
-        url = {https://arxiv.org/abs/1905.02626}
+
+@article{Dash_2019,
+        doi = {10.1021/acs.jctc.9b00476},
+        url = {https://doi.org/10.1021%2Facs.jctc.9b00476},
+        year = 2019,
+        month = {aug},
+        publisher = {American Chemical Society ({ACS})},
+        author = {Monika Dash and Jonas Feldt and Saverio Moroni and Anthony Scemama and Claudia Filippi},
+        title = {Excited States with Selected Configuration Interaction-Quantum Monte Carlo: Chemically Accurate Excitation Energies and Geometries},
+        journal = {Journal of Chemical Theory and Computation}
 }
 
 
 
 %%%% PUBLISHED PAPERS
+@article{Caffarel_2019,
+        doi = {10.1063/1.5114703},
+        url = {https://doi.org/10.1063%2F1.5114703},
+        year = 2019,
+        month = {aug},
+        publisher = {{AIP} Publishing},
+        volume = {151},
+        number = {6},
+        pages = {064101},
+        author = {Michel Caffarel},
+        title = {Evaluating two-electron-repulsion integrals over arbitrary orbitals using zero variance Monte Carlo: Application to full configuration interaction calculations with Slater-type orbitals},
+        journal = {The Journal of Chemical Physics}
+}
+
 @article{Loos_2019,
         doi = {10.1021/acs.jpclett.9b01176},
         url = {https://doi.org/10.1021%2Facs.jpclett.9b01176},