@article{10_4153_CJM_1994_064_8,
     author = {Albert, Michael H. and Lawrence, John},
     title = {Unification in {Varieties} of {Groups:Nilpotent} {Varieties}},
     journal = {Canadian journal of mathematics},
     pages = {1135--1149},
     year = {1994},
     volume = {46},
     number = {6},
     doi = {10.4153/CJM-1994-064-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1994-064-8/}
}