@article{1102978247,
author = {Dennemeyer, R.},
title = {Conjugate surfaces for multiple integral problems in the calculus of variations.},
journal = {Pacific J. Math.},
volume = {31},
number = {3},
year = {1969},
pages = { 621-638},
language = {en},
url = {http://dml.mathdoc.fr/item/1102978247}
}
Dennemeyer, R. Conjugate surfaces for multiple integral problems in the calculus of variations.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 621-638. http://gdmltest.u-ga.fr/item/1102978247/