author = { Beckmann, Martin J. AND Künzi, Hans P. },

title = { Mathematik für Ökonomen 1 },

publisher = {Springer},

year = {1969},

booktitle = {Heidelberger Taschenbücher ; 56},

address = { Berlin },

url = { http://slubdd.de/katalog?TN_libero_mab2 }