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- [42] SUBGROUP STRUCTURE OF HOMOGENEOUS LORENTZ GROUP QUARTERLY JOURNAL OF MATHEMATICS, 1970, 21 (81): : 101 - &
- [45] GROUPS WITH EVERY SUBGROUP 2-SUBNORMAL JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1973, 7 (AUG): : 17 - 18
- [47] GROUPS IN WHICH EVERY SUBGROUP IS ALMOST SUBNORMAL JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1977, 15 (APR): : 221 - 231