@article{MZM_1998_63_4_a7,
     author = {B. S. Kruglikov},
     title = {Nijenhuis tensors and obstructions to constructing pseudoholomorphic mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {541--561},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_4_a7/}
}