Queueing problem,queueing theory,theory of queues,waiting line theory /IT-TECH/
[DE] Theorie der Wartelisten; Theorie der Warteschlangen; Warteschlangentheorie
[EN] Queueing problem; queueing theory; theory of queues; waiting line theory
[FR] problème des files d' attente; théorie des files d' attente; théorie des queues