@article{10_4064_ap_67_1_43_57,
     author = {Michal Fe\v{c}kan},
     title = {Nontrivial critical points of asymptotically quadratic functions at resonances},
     journal = {Annales Polonici Mathematici},
     pages = {43--57},
     publisher = {mathdoc},
     volume = {67},
     number = {1},
     year = {1997},
     doi = {10.4064/ap-67-1-43-57},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-67-1-43-57/}
}