TY - BOOK AU - Ambos-Spied K ed. ED - Conference on Recursion theory( 2nd : 1989 : Oberwolfach,FRG ) ED - TI - Recursion theory: proceedings SN - 3-540-52772-9 U1 - 511.35 PY - 1990/// CY - Berlin PB - Springer-Verlag KW - Recursion theory ER -