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@article{SF_1976__13_134228, author = {T. E. Hays}, title = {Trees and monotone structures.}, journal = {Semigroup forum}, pages = {377--384}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0356.22001}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134228/} }
T. E. Hays. Trees and monotone structures.. Semigroup forum, Tome 13 (1976), pp. 377-384. http://geodesic.mathdoc.fr/item/SF_1976__13_134228/