Mecânica de Lagrange (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Mecânica de Lagrange" in Portuguese language version.

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R. Dvorak, Florian Freistetter (2005). «§ 3.2 Lagrange equations of the first kind». Chaos and stability in planetary systems. [S.l.]: Birkhäuser. p. 24. ISBN 3540282084
H. Haken (2006). Information and self-organization 3ª ed. [S.l.]: Springer. p. 61. ISBN 3540330216
Cornelius Lanczos (1986). «II §5 Auxiliary conditions: the Lagrangian λ-method». The variational principles of mechanics Reprint of University of Toronto 1970 4th ed. [S.l.]: Courier Dover. p. 43. ISBN 0486650677
Henry Zatzkis (1960). «§1.4 Lagrange equations of the second kind». In: DH Menzel. Fundamental formulas of physics. 1 2ª ed. [S.l.]: Courier Dover. p. 160. ISBN 0486605957