@article{10_4064_ap_24_3_285_293,
     author = {K. Badura},
     title = {On a linear functional equation of second order},
     journal = {Annales Polonici Mathematici},
     pages = {285--293},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1970},
     doi = {10.4064/ap-24-3-285-293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-24-3-285-293/}
}