Small Cancellation Conditions Satisfield by One-Relator Groups. Stephen J. Pride (1983) Mathematische Zeitschrift
Small cancellation theory and automatic groups. S.M. Gersten, H.B. Short (1990) Inventiones mathematicae
Small cancellation theory and automatic groups: Part II. S.M. Gersten, H. Short (1991) Inventiones mathematicae
Spherical Diagrams and Indentities Among Relations. D.J. Collins, J. Huebschmann (1982) Mathematische Annalen
SQ-универсальность свободных произведений с объединенными конечными подгруппами К.И. Лоссов (1986) Sibirskij matematiceskij zurnal
Subgroups of small cancellation groups. S.J. Pride, Pat Hill, A.D. Vella (1984) Journal für die reine und angewandte Mathematik