@article{MV_1969_21_4_a9,
     author = {R. \v{Z}. {\DJ}or{\dj}evi\'c},
     title = {Sur un op\'erateur diff\'erentiel g\'en\'eral},
     journal = {Matemati\v{c}ki vesnik},
     pages = {409 },
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/MV_1969_21_4_a9/}
}