Knight, Russell, Caroline Chouinard, Grailing Jones, and Daniel Tran. “Leveraging Multiple Artificial Intelligence Techniques to Improve the Responsiveness in Operations Planning: ASPEN for Orbital Express”. AI Magazine 35, no. 4 (December 22, 2014): 26-36. Accessed October 28, 2020. https://www.aaai.org/ojs/index.php/aimagazine/article/view/2555.