@article{DAN_1968_179_6_a5,
     author = {E. M. Landis},
     title = {Harnack's inequality for second order elliptic equations of {Cordes} type},
     journal = {Doklady Akademii Nauk},
     pages = {1272--1275},
     publisher = {mathdoc},
     volume = {179},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_6_a5/}
}