R. Gabriel. Proceedings of the 2016 ACM International Symposium on New Ideas, New Paradigms, and Reflections on Programming and Software, page 250--268. New York, NY, USA, ACM, (2016)
N. Borenstein, and J. Gosling. Proceedings of the 1st Annual ACM SIGGRAPH Symposium on User Interface Software, page 95--101. New York, NY, USA, ACM, (1988)