@article{CMJ_1997__47_4_a11,
     author = {Cecchi, M. and Do\v{s}l\'a, Z. and Marini, M.},
     title = {Some properties of third order differential operators},
     journal = {Czechoslovak Mathematical Journal},
     pages = {729--748},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1997},
     mrnumber = {1479316},
     zbl = {0903.34032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_4_a11/}
}