@article{JDM_1974__76_146641,
     author = {Th. Br\"ocker},
     title = {Differenzierbare {Mannigfaltigkeiten.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {191--198},
     publisher = {mathdoc},
     volume = {76},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/JDM_1974__76_146641/}
}