1. Guillemin, F. and Pinchon, D., Continued Fraction Analysis of the Duration of an Excursion in an M/M/∞ System, J. Appl. Probab., 1998, vol. 35, pp. 165–183.
2. Gnedenko, B.V. and Kovalenko, I.N., Vvedenie v teoriyu massovogo obsluzhivaniya, Moscow: Nauka, 1987. Translated under the title Introduction to Queueing Theory, Boston: Birkhauser, 1989.
3. Kleinrock, L., Queueing Systems, vol. 1: Theory, New York: Wiley, 1975.
4. Takagi, H., Queueing Analysis: A Foundation of Performance Evaluation, vol. 1: Vacation and Priority Systems, Amsterdam: North-Holland, 1991.
5. Wolff, R.W., Stochastic Modeling and the Theory of Queues, Englewood Cliffs: Prentice Hall, 1989.