@article{10_4153_CJM_1967_013_1,
     author = {McEliece, Robert J.},
     title = {A {Generalization} of {Difference} {Sets}},
     journal = {Canadian journal of mathematics},
     pages = {206--211},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-013-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-013-1/}
}