@article{10_1017_S0017089599000014,
     author = {Kappe, Luise-Charlotte and Visscher, Matthew P. and Sarmin, Nor Haniza},
     title = {Two-generator two-groupsof class two and their nonabelian tensor squares},
     journal = {Glasgow mathematical journal},
     pages = {417--430},
     year = {1999},
     volume = {41},
     number = {3},
     doi = {10.1017/S0017089599000014},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089599000014/}
}