. North-Holland Pub. Co. , Amsterdam 1973 .  L. G . Kovács . Groups with regular automorphisms of order four . Math. Z. , 75 ( 1960/61 ), 277 – 294 .  J. C . Lennox and D. J. S . Robinson . The Theory of Infinite Soluble Groups
Authors:A. Ballester-Bolinches and R. Esteban-Romero
A characterisation of finite soluble groups in which Sylow permutability is a transitive relation by means of subgroup embedding
properties enjoyed by all the subgroups is proved. The key point is an extension of a subnormality criterion due to Wielandt.
References  W. E . Deskins . On quasinormal subgroups of finite groups . Math. Z ., 82 : 125 – 132 , 1963 .  K . Doerk and T.O . Hawkes . Finite Soluble Groups . de Gruyter , Berlin , 1992 .  Z . Han . On s -semipermutable