Independent axiomatizability of quasi-varieties of soluble groups A. I. Budkin OriginalPaper Pages: 81 - 100
Matrix hierarchies of first-order languages and their applications Yu M. Vazhenin OriginalPaper Pages: 101 - 110
Generalized semilattices and m-degrees of index sets. II T. M. Kuz'mina OriginalPaper Pages: 110 - 119