Roberto M. Amadio Gérard Boudol Frédéric Boussinot Ilaria Castellani Reactive Concurrent Programming Revisited. 49-60 2006 162 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2005.12.104 db/journals/entcs/entcs162.html#AmadioBBC06