@article{10_1017_S2040618500033657,
     author = {Yacoub, K. R.},
     title = {A note on semi-special permutations},
     journal = {Glasgow mathematical journal},
     pages = {164--169},
     year = {1958},
     volume = {2},
     number = {4},
     doi = {10.1017/S2040618500033657},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033657/}
}