@article{10_14708_cm_v19i1_5837,
     author = {M. Filar},
     title = {On a certain boundary problem for the equation {\((\Delta} + {a^2)(\Delta} + b^2) u = 0\)},
     journal = {Commentationes Mathematicae},
     pages = { 55--66},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1976},
     doi = {10.14708/cm.v19i1.5837},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v19i1.5837/}
}