@article{ZVMMF_2000_40_7_a5,
     author = {V. I. Berdyshev},
     title = {Differentiation of navigation error with respect to an approximating function and a geophysical field fragment},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1003--1011},
     year = {2000},
     volume = {40},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_7_a5/}
}