@article{10_4064_ap_30_1_5_8,
     author = {Stefan Czerwik},
     title = {On the existence and uniqueness of convex solutions of a functional equation in the indeterminate case},
     journal = {Annales Polonici Mathematici},
     pages = {5--8},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1974},
     doi = {10.4064/ap-30-1-5-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-1-5-8/}
}