@article{10_4064_ap_30_1_1_4,
     author = {Z. Kominek and J. Matkowski},
     title = {On the existence of a convex solution of the functional equation \ensuremath{\varphi}(x) = h(x,\ensuremath{\varphi}[f(x)])},
     journal = {Annales Polonici Mathematici},
     pages = {1--4},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1974},
     doi = {10.4064/ap-30-1-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-1-1-4/}
}