@article{10_4153_CJM_1977_016_8,
     author = {Steffens, K.},
     title = {Matchings in {Countable} {Graphs}},
     journal = {Canadian journal of mathematics},
     pages = {165--168},
     year = {1977},
     volume = {29},
     number = {1},
     doi = {10.4153/CJM-1977-016-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-016-8/}
}