Approximate symmetries and preservation laws
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Number theory, algebra, analysis and their applications, Tome 200 (1991), pp. 35-45.

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     author = {V. A. Baikov and R. K. Gazizov and N. Kh. Ibragimov},
     title = {Approximate symmetries and preservation laws},
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     pages = {35--45},
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     volume = {200},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1991_200_a3/}
}
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V. A. Baikov; R. K. Gazizov; N. Kh. Ibragimov. Approximate symmetries and preservation laws. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Number theory, algebra, analysis and their applications, Tome 200 (1991), pp. 35-45. http://geodesic.mathdoc.fr/item/TM_1991_200_a3/