@article{10_4153_CMB_1989_064_2,
     author = {Nash, John C. M.},
     title = {On {B} {4-Sequences}},
     journal = {Canadian mathematical bulletin},
     pages = {446--449},
     year = {1989},
     volume = {32},
     number = {4},
     doi = {10.4153/CMB-1989-064-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1989-064-2/}
}