Van Dam, A., and Evans, D. "A compact data structure for storing, retrieving and manipulating line drawings," pp601-610

[AFIPS] Proceedings of the 1967 Spring Joint Compu (1967) [AFIPS] Proceedings of the 1967 Spring Joint Computer Conference, April 18-20, Atlantic City, N. J. SJCC 30  

Languages mentioned DSPL {1967} Display Systems Programming Language