Add missing authors to citation

Author: marcharper

citations.md

@@ -2,7 +2,7 @@
 
 ### 2019
 
-* "Stability of defection, optimisation of strategies and the limits of memory in the Prisoner’s Dilemma." arXiv preprint arxiv:1911.12112 (2019). [ArXiv](https://arxiv.org/abs/1911.12112)
+* Glynatsi, Nikoleta E., and Vincent A. Knight. "Stability of defection, optimisation of strategies and the limits of memory in the Prisoner’s Dilemma." arXiv preprint arxiv:1911.12112 (2019). [ArXiv](https://arxiv.org/abs/1911.12112)
 * Glynatsi, Nikoleta E., and Vincent A. Knight. "A systematic literature review of the Prisoner's Dilemma; collaboration and influence." arXiv preprint arXiv:1911.06128 (2019). [ArXiv](https://arxiv.org/abs/1911.06128)
 * O'Neil, Daniel A., and Mikel D. Petty. "Synthesizing Social Networks with Iterated Prisoners' Dilemma." [Proceedings of the International Conference on Modeling, Simulation and Visualization Methods (MSV).](https://csce.ucmss.com/cr/books/2019/LFS/CSREA2019/MSV2345.pdf) The Steering Committee of The World Congress in Computer Science, Computer Engineering and Applied Computing (WorldComp), 2019.
 * Collins, David. "A Genetic Algorithm Approach to the Iterated Prisoner’s Dilemma." [Undergraduate Research in Natural and Clinical Science and Technology Journal](https://urncst.com/index.php/urncst/article/view/155) (2019): 1-9.