%0 Journal Article %A DOLINKA, IGOR %T ON FREE SPECTRA OF LOCALLY TESTABLE SEMIGROUP VARIETIES %J Glasgow mathematical journal %D 2011 %P 623-629 %V 53 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089511000188/ %R 10.1017/S0017089511000188 %F 10_1017_S0017089511000188