@article{10_4064_fm_120_1_53_62,
     author = {E. Graczy\'nska and F. Pastjin},
     title = {A generalization of {P{\l}onka} sums},
     journal = {Fundamenta Mathematicae},
     pages = {53--62},
     publisher = {mathdoc},
     volume = {120},
     number = {1},
     year = {1984},
     doi = {10.4064/fm-120-1-53-62},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-120-1-53-62/}
}