CHOCS
Please expand.
References
@inproceedings{thomsen_1989,
title = {A calculus of higher order communicating systems},
doi = {10.1145/75277.75290},
booktitle = {{POPL} '89: {Proceedings} of the 16th {ACM} {SIGPLAN}-{SIGACT} {Symposium} on {Principles} of {Programming} {Languages}},
publisher = {ACM},
author = {Thomsen, B.},
year = {1989},
pages = {143--154}
}