ZholtkevychG.M., NazyrovZ.F., and IgnatovS.Y. “Grouping оf Complexes оf Multiphase Queuing Systems”. Journal of Information Technologies in Education (ITE), no. 3 (December 9, 2009): 044-056. Accessed May 18, 2024. http://ite.kspu.edu/index.php/ite/article/view/627.