@article{AFM_1998_23_2_a4,
     author = {A. Hinkkanen},
     title = {Iteration, level sets, and zeros of derivatives of meromorphic functions},
     journal = {Annales Fennici Mathematici},
     pages = {317--388},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1998_23_2_a4/}
}