@article{MM2_1969__1_153969,
     author = {Dieter Pumpl\"un and Helmut R\"ohrl},
     title = {Morphismen von {Funktoren.}},
     journal = {Manuscripta mathematica},
     pages = {87--98},
     publisher = {mathdoc},
     volume = {1},
     year = {1969},
     zbl = {0164.01302},
     url = {http://geodesic.mathdoc.fr/item/MM2_1969__1_153969/}
}