added citations paper.md
Added citations pvlib, pvfactors, pvsyst and sam citations
pages = {459--472},
title = {{The RADIANCE lighting simulation and rendering system}},
year = {1994}}
+
+@article{pvlib,
+ author = {Holmgren, William F. and Hansen, Clifford W. and Mikofski, Mark M.},
+ doi = {https://doi.org/10.21105/joss.00884},
+ journal = {Journal of Open Source Software},
+ pages = {884},
+ title = {{pvlib python: a python package for modeling solar energy systems}},
+ volume = {3(29)},
+ year = {2018}}
+
+@inproceedings{PVfactors,
+ author = {Anoma, M. and Jacob, D., and Bourne, B.C., and Scholl, J.A., and Riley, D.M. and Hansen, C.W.},
+ booktitle = {44th IEEE Photovoltaic Specialists Conference Proceedings, Washington, DC},
+ title = {{View Factor Model and Validation for Bifacial PV and Diffuse Shade on Single-Axis Trackers.}},
+ year = {2017}}
+
+@inproceedings{SAM,
+ author = {Blair, Nate and DiOrio, Nicholas and Freeman, Janine and Gilman, Paul and Janzou, Steven and Neises, Ty and Wagner, Michael},
+ institution = {National Renewable Energy Laboratory, Golden, CO},
+ pages = {1--19},
+ publisher = {NREL/TP-6A20-70414},
+ title = {{System Advisor Model (SAM) General Description (Version 2017.9.5}},
+ year = {2018}}
+
+@inproceedings{Marion2017,
+ author = {Marion, Bill and Macalpine, Sara and Deline, Chris and Asgharzadeh, Amir and Toor, Fatima and Riley, Daniel and Stein, Joshua and Hansen, Clifford},
+ booktitle = {44th IEEE Photovoltaic Specialists Conference (PVSC), Washington, DC.},
+ doi = {10.1109/PVSC.2017.8366263},
+ isbn = {9781509056057},
+ pages = {1537--1542},
+ publisher = {IEEE},
+ title = {{A practical irradiance model for bifacial PV modules}},
+ year = {2017}}
+
+@misc{bifacialvf,
+ author = {NREL},
+ mendeley-groups = {Thesis},
+ publisher = {GitHub},
+ title = {{bifacialVF}},
+ url = {http://github.com/NREL/bifacialvf},
+ year = {2019}}
+
+
