@article{DAN_1976_228_4_a10,
     author = {M. I. Khazan},
     title = {Differentiability of nonlinear semigroups and the classical solvability of nonlinear boundary value problems for the equation 
},
     journal = {Doklady Akademii Nauk},
     pages = {805--808},
     publisher = {mathdoc},
     volume = {228},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_4_a10/}
}