@article{ZNSL_1990_180_a15,
     author = {V. S. Yarunin},
     title = {Functional integration and variational equations of nonlinear optics},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {170--175},
     publisher = {mathdoc},
     volume = {180},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_180_a15/}
}