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@article{MASLO_1977__27_1_a5, author = {Zelinka, Bohdan}, title = {On a problem of {R.} {Halin} concerning subgraphs of infinite graphs}, journal = {Mathematica slovaca}, pages = {43--45}, publisher = {mathdoc}, volume = {27}, number = {1}, year = {1977}, mrnumber = {0465953}, zbl = {0348.05112}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1977__27_1_a5/} }
Zelinka, Bohdan. On a problem of R. Halin concerning subgraphs of infinite graphs. Mathematica slovaca, Tome 27 (1977) no. 1, pp. 43-45. http://geodesic.mathdoc.fr/item/MASLO_1977__27_1_a5/