Simon S. Lam, A. Udaya Shankar. A Relational Notation for State Transition Systems. IEEE Trans. Software Eng., 16(7):755-775, 1990. [doi]
@article{LamS90, title = {A Relational Notation for State Transition Systems}, author = {Simon S. Lam and A. Udaya Shankar}, year = {1990}, url = {http://www.computer.org/tse/ts1990/e0755abs.htm}, researchr = {https://researchr.org/publication/LamS90}, cites = {0}, citedby = {0}, journal = {IEEE Trans. Software Eng.}, volume = {16}, number = {7}, pages = {755-775}, }