Bellman, R. (1966). Pertubation techniques in mathematics, engineering and physics. Dover.
Chicago Edition CitationBellman, Richard. Pertubation Techniques in Mathematics, Engineering and Physics. Dover, 1966.
MLA Edition CitationBellman, Richard. Pertubation Techniques in Mathematics, Engineering and Physics. Dover, 1966.
Warning: These citations may not always be 100% accurate.