@article{10_21136_MB_2003_133937,
     author = {Rach\r{u}nkov\'a, Irena and Tvrd\'y, Milan and Vrko\v{c}, Ivo},
     title = {Resonance and multiplicity in periodic boundary value problems with singularity},
     journal = {Mathematica Bohemica},
     pages = {45--70},
     publisher = {mathdoc},
     volume = {128},
     number = {1},
     year = {2003},
     doi = {10.21136/MB.2003.133937},
     mrnumber = {1973424},
     zbl = {1023.34015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2003.133937/}
}