@article{10_4064_ap_65_2_119_128,
     author = {Weinian Zhang},
     title = {PM functions, their characteristic intervals and iterative roots},
     journal = {Annales Polonici Mathematici},
     pages = {119--128},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1996},
     doi = {10.4064/ap-65-2-119-128},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-65-2-119-128/}
}