Lefschetz.S. (1956). Contributions to the Theory of Naonlinear Ocillations (1956.). Princeton University.
Chicago Edition CitationLefschetz.S. Contributions to the Theory of Naonlinear Ocillations. 1956. Princeton: Princeton University, 1956.
MLA Edition CitationLefschetz.S. Contributions to the Theory of Naonlinear Ocillations. 1956. Princeton University, 1956.
Warning: These citations may not always be 100% accurate.