Ruiz- Pala, Ernesto, Waiting-line models : An introd. to their theory and application / By Ernesto Ruíz - pala, Carlos Avila - beloso and William w. hines - 180 páginas - Reinhold industrial engineering and management sciences series . Subjects--Topical Terms: Teoría de las colas (Matemáticas) LC Class. No.: QA273 / R89