@article{10_4153_CJM_1986_064_4,
     author = {Leech, John},
     title = {Four {Integers} whose {Twelve} {Quotients} {Sum} to {Zero}},
     journal = {Canadian journal of mathematics},
     pages = {1261--1280},
     year = {1986},
     volume = {38},
     number = {5},
     doi = {10.4153/CJM-1986-064-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1986-064-4/}
}