@article{DE_2003_39_7_a4,
     author = {V. M. Volkov and N. P. Matsuka},
     title = {The {Paraxial} {Approximation} to the {Wave} {Equation} in {Curvilinear} {Coordinates} for {Numerical} {Simulation} of {Optical} {Beam} {Diffraction}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {904--911},
     publisher = {mathdoc},
     volume = {39},
     number = {7},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_7_a4/}
}