@article{10_4153_CJM_1993_018_x,
     author = {Magurn, Bruce A.},
     title = {Birelative {K} 2 of {Groups} of {Square-Free} {Order}},
     journal = {Canadian journal of mathematics},
     pages = {369--379},
     year = {1993},
     volume = {45},
     number = {2},
     doi = {10.4153/CJM-1993-018-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1993-018-x/}
}