@article{10_1017_S2040618500033761,
     author = {Yacoub, K. R.},
     title = {A {Note} on the {Classes} of {Non-Linear} {Semi-Special} {Permutations}},
     journal = {Glasgow mathematical journal},
     pages = {3--6},
     year = {1958},
     volume = {4},
     number = {1},
     doi = {10.1017/S2040618500033761},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033761/}
}