1. Algorithmic unsolvability of problems of recognition of certain properties of groups;Adyan;Dokl. Akad. Nauk SSSR (N.S.),1955
2. Unsolvability of some algorithmic problems in the theory of groups;Adyan;Trudy Moskov Math. Obshch.,1957
3. Finitely presented groups and algorithms;Adyan;Dokl. Akad. Nauk SSSR (N.S.),1957
4. On algorithmic problems in effectively complete classes of groups;Adyan;Dokl. Akad. Nauk SSSR,1958
5. Som unsolvable problems about elements and subgroups of groups;Baumslag;Math. Scand.,1959