the device was acknowledged by historians of computer science – e.g. Maciej Sysło claims it has to be conceded that Karpiński's effort preceded any other...

(Boca Raton, Fla., 1982), Congressus Numerantium, 36: 59–67, MR 0726050 Sysło, Maciej M. (1989), "Sequential coloring versus Welsh–Powell bound", Discrete...