TY  - JOUR
AU  - Tomkinson, M. J.
TI  - Prefrattini Subgroups and Cover-Avoidance Properties in U-Groups
JO  - Canadian journal of mathematics
PY  - 1975
SP  - 837
EP  - 851
VL  - 27
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-091-1/
DO  - 10.4153/CJM-1975-091-1
ID  - 10_4153_CJM_1975_091_1
ER  -