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- [5] CURVATURE GROUPS OF A HYPERSURFACE IN EUCLIDEAN SPACE ACTA MATHEMATICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1972, 23 (1-2): : 21 - 31
- [8] CLASSES OF INTRANSITIVITY OF EUCLIDEAN SPACE MOTION GROUPS DOKLADY AKADEMII NAUK SSSR, 1976, 226 (03): : 520 - 522