@article{10_1017_S0017089502001003,
     author = {Evan, Joseph},
     title = {PERMUTABLE {DIAGONAL-TYPE} {SUBGROUPS} {OF} $G\times H$},
     journal = {Glasgow mathematical journal},
     pages = {73--77},
     year = {2003},
     volume = {45},
     number = {1},
     doi = {10.1017/S0017089502001003},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089502001003/}
}