Simmonds, J. G., & Mann, J. E. (1998). A first look at perturbation theory (2nd ed.). Mineola, NY.: Dover Publications.
Παραπομπή Chicago StyleSimmonds, James G., and James E. Mann. A First Look At Perturbation Theory. 2nd ed. Mineola, NY.: Dover Publications, 1998.
Παραπομπή MLASimmonds, James G., and James E. Mann. A First Look At Perturbation Theory. 2nd ed. Mineola, NY.: Dover Publications, 1998.
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