\hspace{0.5cm} \b{tabular}{|l@{\hspace{2.5cm}}r|} Ada & [DoD82] \\ Concurrent C & [Ts84] \\ Concurrent Prolog & [Sh86] \\ CSP & [Ho78] \\ Emerald & [Bl87] \\ Linda & [Ge86] \\ Occam & [In84] \\ Parlog & [CG86] \\ POOL & [Am87] \\ \e{tabular}