@article{10_14708_cm_v25i1_6120,
     author = {R. Rabczuk and Z. R{\cyro}man{\cyro}wicz},
     title = {Sur les p\'eriodes principales de la somme et du produit des fonctions p\'eriodiques},
     journal = {Commentationes Mathematicae},
     pages = { 123--134},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1985},
     doi = {10.14708/cm.v25i1.6120},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v25i1.6120/}
}