Kopf, J. O.; Plauger, P. J. (1968). "JANUS: a flexible approach to realtime timesharing". Proceeding AFIPS '68 (Fall, Part II) Proceedings of the December 9–11, 1968, Fall Joint Computer Conference, Part II. Fall Joint Computer Conference. pp. 1033–1042. doi:10.1145/1476706.1476722. S2CID15577630.
Kopf, J. O.; Plauger, P. J. (1968). "JANUS: a flexible approach to realtime timesharing". Proceeding AFIPS '68 (Fall, Part II) Proceedings of the December 9–11, 1968, Fall Joint Computer Conference, Part II. Fall Joint Computer Conference. pp. 1033–1042. doi:10.1145/1476706.1476722. S2CID15577630.