@article{MV_1968_20_4_a15,
     author = {G. M. Karapandjitch},
     title = {Sur quelques equations aux derivees partielles du deuxieme ordre},
     journal = {Matemati\v{c}ki vesnik},
     pages = {513 },
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MV_1968_20_4_a15/}
}