Geodesic
Development of the Valiron–Levin theorem on the least possible type of entire functions with a given upper $\rho$-density of roots
Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 49 (2013), pp. 132-164 
A. Yu. Popov. Development of the Valiron–Levin theorem on the least possible type of entire functions with a given upper $\rho$-density of roots. Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 49 (2013), pp. 132-164. http://geodesic.mathdoc.fr/item/CMFD_2013_49_a3/
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     author = {A. Yu. Popov},
     title = {Development of the {Valiron{\textendash}Levin} theorem on the least possible type of entire functions with a~given upper $\rho$-density of roots},
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     pages = {132--164},
     year = {2013},
     volume = {49},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2013_49_a3/}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

An entire function such that its roots have a given $\rho$-density and are located in an angle or on a ray is considered. For such a function, we solve the problem on the least possible type at order $\rho$. The case without assumptions about the location of the roots was considered by Valiron; the corresponding problem was completely solved by Levin.

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