An Ambiguity in the Description of ALGOL 60 CACM October, 1969 Herriot, J. G. Ising problem, zero-one sequences 5.39 CA691013 JB February 15, 1978 1:40 PM 1833 5 1833 1833 5 1833 1833 5 1833 2066 5 1833 1833 6 1833 1842 6 1833