On primitive recursive algorithms and the greatest common divisor function.

Yiannis N. Moschovakis On primitive recursive algorithms and the greatest common divisor function. 1-30 2003 1-3 Theor. Comput. Sci. 301 http://dx.doi.org/10.1016/S0304-3975(02)00487-5 db/journals/tcs/tcs301.html#Moschovakis03