J. McAffer. ECOOP’95 — Object-Oriented Programming, 9th European Conference, Åarhus, Denmark, August 7–11, 1995, volume 952 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (1995)
S. Marr, E. Gonzalez Boix, and H. Mössenböck. Proceedings of the 9th Arbeitstagung Programmiersprachen, volume 1559 of ATPS'16, page 91--95. CEUR-WS, (Feb 25, 2016)