Lua APA (7ú heag.)
Bobylev, N. A., Burman, Y. M., & Korovin, S. K. (1994). Approximation procedures in nonlinear oscillation theory. W. de Gruyer.
Lua i Stíl Chicago (17ú heag.)
Bobylev, N. A., Yu. M. Burman, agus S. K. Korovin. Approximation Procedures in Nonlinear Oscillation Theory. Berlin ; New York: W. de Gruyer, 1994.
Lua MLA (9ú heag.)
Bobylev, N. A., et al. Approximation Procedures in Nonlinear Oscillation Theory. W. de Gruyer, 1994.
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