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@article{CMH_1955__29_139099, author = {Albert Pfluger}, title = {Extremall\"angen und {Kapazit\"at.}}, journal = {Commentarii mathematici Helvetici}, pages = {120--131}, publisher = {mathdoc}, volume = {29}, year = {1955}, zbl = {0066.32802}, url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139099/} }
Albert Pfluger. Extremallängen und Kapazität.. Commentarii mathematici Helvetici, Tome 29 (1955), pp. 120-131. http://geodesic.mathdoc.fr/item/CMH_1955__29_139099/