Salle, J. L., & Lefschetz, S. (1961). Stability by Liapunov's direct method: With applications. New York: Academic Press.
Trích dẫn kiểu ChicagoSalle, Joseph La., và Solomon Lefschetz. Stability By Liapunov's Direct Method: With Applications. New York: Academic Press, 1961.
MLA CitationSalle, Joseph La., và Solomon Lefschetz. Stability By Liapunov's Direct Method: With Applications. New York: Academic Press, 1961.
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