adding citation

Author: bknueven

README.md

@@ -27,15 +27,17 @@ This is divided into three sets of generators, each with varying load and reserv
 Generator and load data curated from publicly available data from the California ISO. There are four different load profiles by date, and varying reserve requirements as a percentage of load: 0%, 1%, 3%, and 5%. When using this data, please cite [1].
 
 ### /ferc/*.json
-Generator data based on the publicly available unit commitment test instance from the Federal Energy Regulatory Commission. Load, reserves, and wind data is curated from publicly available data from PJM. The 'lw' moniker denotes a wind profile scaled to be 2% of annual load; the 'hw' denotes a wind profile scaled to be 30% of annual load. When using this data, please cite [1].
+Generator data based on the publicly available unit commitment test instance from the Federal Energy Regulatory Commission. Load, reserves, and wind data is curated from publicly available data from PJM. The 'lw' moniker denotes a wind profile scaled to be 2% of annual load; the 'hw' denotes a wind profile scaled to be 30% of annual load. When using this data, please cite [1],[2].
 
 ### /rts_gmlc/*.json
-Generator, load, and reserve data is curated from the publicly available [RTS-GMLC test system](https://github.com/GridMod/RTS-GMLC). Hourly generator ramp-rates are divided by a factor of three to ensure all the technical features listed above are captured at an hourly time scale. When using this data, please cite [2].
+Generator, load, and reserve data is curated from the publicly available [RTS-GMLC test system](https://github.com/GridMod/RTS-GMLC). Hourly generator ramp-rates are divided by a factor of three to ensure all the technical features listed above are captured at an hourly time scale. When using this data, please cite [3].
 
 #### References
 [1] Knueven, Bernard, James Ostrowski, and Jean-Paul Watson. "On mixed integer programming formulations for the unit commitment problem." Pre-print available at [http://www.optimization-online.org/DB_HTML/2018/11/6930.pdf](http://www.optimization-online.org/DB_HTML/2018/11/6930.pdf) (2018).
 
-[2] Barrows, Clayton, Aaron Bloom, Ali Ehlen, Jussi Ikaheimo, Jennie Jorgenson, Dheepak Krishnamurthy, Jessica Lau et al. "The IEEE Reliability Test System: A Proposed 2019 Update." IEEE Transactions on Power Systems (2019).
+[2] Krall, Eric, Michael Higgins, and Richard P. O’Neill. "RTO unit commitment test system." Federal Energy Regulatory Commission (2012).
+
+[3] Barrows, Clayton, Aaron Bloom, Ali Ehlen, Jussi Ikaheimo, Jennie Jorgenson, Dheepak Krishnamurthy, Jessica Lau et al. "The IEEE Reliability Test System: A Proposed 2019 Update." IEEE Transactions on Power Systems (2019).
 
 
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