@article{10_4153_CJM_2012_028_3,
     author = {Kallel, Sadok and Taamallah, Walid},
     title = {The {Geometry} and {Fundamental} {Group} of {Permutation} {Products} and {Fat} {Diagonals}},
     journal = {Canadian journal of mathematics},
     pages = {575--599},
     year = {2013},
     volume = {65},
     number = {3},
     doi = {10.4153/CJM-2012-028-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2012-028-3/}
}