Kosinski, Paul R. "A straightforward denotational semantics for non-determinate data flow programs" pp214-221

[POPL 1978] (1978) [ACM SIGACT-SIGPLAN] Proceedings of the 5th ACM SIGACT-SIGPLAN symposium on Principles of programming languages 1978 , Tucson, Arizona  

Languages mentioned DFPL {1972} Pure graphical dataflow language