Bruni, Roberto and Frutos Escrig, David de and Martí Oliet, Narciso and Montanari, Ugo (2000) Bisimilarity congruences for open terms and term graphs via tile logic. In CONCUR 2000 — Concurrency Theory : 11th International Conference University Park, PA, USA, August 22–25, 2000 Proceedings. Lecture notes in computer science (1877). Springer, pp. 259-274. ISBN 978-3-540-67897-7