@article{10_4153_CJM_1969_152_3,
     author = {Johnson, Norman Lloyd},
     title = {A {Classification} of {Semi-Translation} {Planes}},
     journal = {Canadian journal of mathematics},
     pages = {1372--1387},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-152-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-152-3/}
}