@article{10_4064_cm_66_1_109_12,
     author = {Bogdan Przeradzki},
     title = {Three methods for the study of semilinear equations at resonance},
     journal = {Colloquium Mathematicum},
     pages = {109--12},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1993},
     doi = {10.4064/cm-66-1-109-12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-66-1-109-12/}
}