Griffiths, P. A. (1983). Exterior Differential Systems and the calculus of variations. Birkhäuser.
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Chicago-čujuhus (17. p.)
Griffiths, Phillip A. Exterior Differential Systems and the Calculus of Variations. Boston, Basel, Stuttgart: Birkhäuser, 1983.
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MLA-čujuhus (9. p.)
Griffiths, Phillip A. Exterior Differential Systems and the Calculus of Variations. Birkhäuser, 1983.
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