@article{10_4064_fm182_2_4,
     author = {Kevin M. Pilgrim},
     title = {Bounded geometry of quadrilaterals
 and variation of multipliers for rational maps},
     journal = {Fundamenta Mathematicae},
     pages = {137--150},
     publisher = {mathdoc},
     volume = {182},
     number = {2},
     year = {2004},
     doi = {10.4064/fm182-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm182-2-4/}
}