@article{SIGMA_2007_3_a4,
     author = {Alexander V. Shapovalov and Roman O. Rezaev and Andrey Yu. Trifonov},
     title = {Symmetry {Operators} for the {Fokker{\textendash}Plank{\textendash}Kolmogorov} {Equation} with {Nonlocal} {Quadratic} {Nonlinearity}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2007},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a4/}
}