@article{10_21136_CPM_1965_117538,
     author = {Drs, Ladislav},
     title = {Konjugierte {Perspektiven}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {43--49},
     year = {1965},
     volume = {90},
     number = {1},
     doi = {10.21136/CPM.1965.117538},
     zbl = {0137.43302},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1965.117538/}
}