Geodesic
The stretching coefficients of pseudo-Anosov homeomorphisms
Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part 6, Tome 167 (1988), pp. 111-116

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This paper is devoted to the proof of the following theorem: Let $1$. The number of conjugacy classes of pseudo-Anosov elements $f$ of the group $\operatorname{Mod}_S$ with stretching factor $\lambda(f)\leq c$ is finite. 
@article{ZNSL_1988_167_a6,
     author = {N. V. Ivanov},
     title = {The stretching coefficients of {pseudo-Anosov} homeomorphisms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {111--116},
     publisher = {mathdoc},
     volume = {167},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_167_a6/}
}
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N. V. Ivanov. The stretching coefficients of pseudo-Anosov homeomorphisms. Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part 6, Tome 167 (1988), pp. 111-116. http://geodesic.mathdoc.fr/item/ZNSL_1988_167_a6/