From: Frederick Williams on
If J.R. Buchi, Turing machines and the entscheidungsproblem,
Mathematische Annalen, vol 148, pp 201�213, 1962 is available for free
somewhere on the Internet I won't object if someone tells me where.
--
Which of the seven heavens / Was responsible her smile /
Wouldn't be sure but attested / That, whoever it was, a god /
Worth kneeling-to for a while / Had tabernacled and rested.