TY  - BOOK
AU  - Lennox John
AU  -  Stonehewer Stewart E.
TI  - Subnormal subgroups of groups
T2  - Oxford mathematical monographs
U1  - B27, M7 
PY  - 1987///
CY  - Oxford
PB  - Clarendon         
N1  - Bibliography 243-249p
ER  -