Added references.bib from statphys.

references.bib

+@book{van1992stochastic,
+  title = {Stochastic Processes in Physics and Chemistry},
+  publisher = {Elsevier},
+  edition = {Third Edition},
+  address = {Amsterdam},
+  year = {2007},
+  series = {North-Holland Personal Library},
+  doi = {10.1016/B978-044452965-7/50004-0},
+  author = {N.G. {van Kampen}}
+}
+
+@article{zia2009making,
+  title={Making sense of the {L}egendre transform},
+  author={Zia, Royce KP and Redish, Edward F and McKay, Susan R},
+  journal={American Journal of Physics},
+  volume={77},
+  number={7},
+  pages={614--622},
+  year={2009},
+  publisher={American Association of Physics Teachers}
+}
+
+@book{tong_statphys,
+  title={Statistical Physics},
+  author={Tong, David},
+  year={2012},
+  publisher={University of Cambridge},
+  note={\url{http://www.damtp.cam.ac.uk/user/tong/statphys.html}}
+}