@article{CMUC_1995_36_4_a1,
     author = {Fe\v{c}kan, Michal},
     title = {Nonnegative solutions of nonlinear integral equations},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {615--627},
     year = {1995},
     volume = {36},
     number = {4},
     mrnumber = {1378685},
     zbl = {0840.45007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1995_36_4_a1/}
}