@article{JDM_1935__45_146071,
     author = {O. Bottema},
     title = {\"Uber pythagoreische {Tetraeder.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {53--56},
     publisher = {mathdoc},
     volume = {45},
     year = {1935},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JDM_1935__45_146071/}
}