@article{10_4153_CMB_1975_051_8,
     author = {Spencer, James D.},
     title = {Relations {Between} {Boundary} {Value} {Functions} for a {Nonlinear} {Differential} {Equation} and its {Variational} {Equations*}},
     journal = {Canadian mathematical bulletin},
     pages = {269--276},
     year = {1975},
     volume = {18},
     number = {2},
     doi = {10.4153/CMB-1975-051-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-051-8/}
}