Geodesic
The complete figure for second order multiple integral problems in the calculus of variations.
Aequationes mathematicae, Tome 14 (1976), pp. 363-386.

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     author = {H.S.P. Gr\"asser},
     title = {The complete figure for second order multiple integral problems in the calculus of variations.},
     journal = {Aequationes mathematicae},
     pages = {363--386},
     publisher = {mathdoc},
     volume = {14},
     year = {1976},
     zbl = {0348.49016},
     url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136598/}
}
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H.S.P. Grässer. The complete figure for second order multiple integral problems in the calculus of variations.. Aequationes mathematicae, Tome 14 (1976), pp. 363-386. http://geodesic.mathdoc.fr/item/AM2_1976__14_136598/