Gabriel, Edith, Barry S. Rowlingson, and Peter J. Diggle. “Stpp: An R Package for Plotting, Simulating and Analyzing Spatio-Temporal Point Patterns”. Journal of Statistical Software 53, no. 2 (April 21, 2013): 1–29. Accessed May 21, 2022. https://www.jstatsoft.org/index.php/jss/article/view/v053i02.