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Webb M. C.: Nilpotent torsion-free rings and triangles of types. In: Acta scientiarum mathematicarum, (41) 1-2. pp. 253-257. (1979)
Stratton Andrew E.; Webb M. C.: Type sets and nilpotent multiplications. In: Acta scientiarum mathematicarum, (41) 1-2. pp. 209-213. (1979)
Webb M. C.: A bound for the nilstufe of a group. In: Acta scientiarum mathematicarum, (39) 1-2. pp. 185-188. (1977)