@article{10_21136_CPM_1973_117808,
     author = {Havrda, Jan},
     title = {K zobecn\v{e}n{\'\i} pojmu projektor},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {265--268},
     publisher = {mathdoc},
     volume = {098},
     number = {3},
     year = {1973},
     doi = {10.21136/CPM.1973.117808},
     mrnumber = {0377484},
     zbl = {0259.46023},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1973.117808/}
}