A scheduling problem

S. M. Johnson, “Optimal two-and three-operational production schedules taking into account setup and termination time,” in: Scheduling [Russian translation], Progress, Moscow (1966). V. Ya. Burdyuk and V. V. Shkurba, “Scheduling theory, problems and methods of solution (survey),” Kibernetika, No. 1 (1971). A. L. Lur'e, “On certain scheduling problems,” in: Problems of Cybernetics [in Russian], No. 7, Moscow (1962).