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