@article{10_21136_CMJ_1994_128474,
     author = {Spraker, John S. and Biles, Daniel C.},
     title = {Filippov's operation and some attributes},
     journal = {Czechoslovak Mathematical Journal},
     pages = {513--520},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {1994},
     doi = {10.21136/CMJ.1994.128474},
     mrnumber = {1288168},
     zbl = {0816.34010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1994.128474/}
}