@article{MAT_1964_8_5_a10,
     author = {R. Bellman},
     title = {Directions of mathematical research in nonlinear circuit theory},
     journal = {Matematika},
     pages = {156--176},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1964_8_5_a10/}
}