@article{10_4064_ap_69_2_99_105,
     author = {Maria Pli\'s},
     title = {Poincar\'e theorem and nonlinear {PDE's}},
     journal = {Annales Polonici Mathematici},
     pages = {99--105},
     publisher = {mathdoc},
     volume = {69},
     number = {2},
     year = {1998},
     doi = {10.4064/ap-69-2-99-105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-69-2-99-105/}
}