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@article{PORMA_1948__7_3_114665, author = {B\"uchi, J. Richard}, title = {Die {Boole'sche} partialordung und die {Paarung} von {Gefuegen}}, journal = {Portugaliae mathematica}, pages = {119--180}, publisher = {mathdoc}, volume = {7}, number = {3}, year = {1948}, mrnumber = {0034369}, zbl = {0038.02002}, language = {de}, url = {http://geodesic.mathdoc.fr/item/PORMA_1948__7_3_114665/} }
Büchi, J. Richard. Die Boole'sche partialordung und die Paarung von Gefuegen. Portugaliae mathematica, Tome 7 (1948) no. 3, pp. 119-180. http://geodesic.mathdoc.fr/item/PORMA_1948__7_3_114665/