@article{PIM_1981_N_S_29_43_a8,
     author = {Valentina Harizanov},
     title = {On the {Functional} {Equation} f phi f = f},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {61 },
     publisher = {mathdoc},
     volume = {_N_S_29},
     number = {43},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a8/}
}