@article{JEMS_2015_17_7_a0,
     author = {Nicholas D. Alikakos and Giorgio Fusco},
     title = {A maximum principle for systems with variational structure and an application to standing waves},
     journal = {Journal of the European Mathematical Society},
     pages = {1547--1567},
     publisher = {mathdoc},
     volume = {17},
     number = {7},
     year = {2015},
     doi = {10.4171/jems/538},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/538/}
}