Robuta

https://permut.blogs.uv.es/2017/04/26/paper-on-s-semipermutable-subgroups-and-soluble-pst-groups-published-in-mediterr-j-math/ Paper “On S-Semipermutable Subgroups and Soluble PST-Groups” published in Mediterr. J. Math. | Blog... published in j math paper semipermutable subgroups