@book{ BA09344862,
 author = "Maurin, Krzysztof",
 title = "Calculus of variations and classical field theory",
 publisher = "Aarhus Universitet, Matematisk Institut",
 year = "1972",
 series = "Lecture notes series",
 number = "no. 34",
 URL = "https://ci.nii.ac.jp/ncid/BA09344862"
}
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