Бабак, В., В. Харченко, and Є. Знаковська. “Research of Collision Probability Behaviour the Appreciated Behind a Method of the Rare Events Modelling at Optimum Sample”. Proceedings of National Aviation University (archive), vol. 22, no. 4, Apr. 2004, pp. 3-7, doi:10.18372/2306-1472.22.1049.