%0 Journal Article
%A L.M. Martynov
%T On spectra of solvability and attainability for varieties of semigroups.
%J Semigroup forum
%D 1989
%P 129-156
%V 39
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1989__39_2_134983/
%F SF_1989__39_2_134983