@article{10_4153_CJM_1992_017_7,
     author = {Day, Alan},
     title = {Doubling {Constructions} in {Lattice} {Theory}},
     journal = {Canadian journal of mathematics},
     pages = {252--269},
     year = {1992},
     volume = {44},
     number = {2},
     doi = {10.4153/CJM-1992-017-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-017-7/}
}