Geodesic
Behavior of the roots of the equation $w'_1(z)+\sigma w_1(z)=0$
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 9, Tome 78 (1978), pp. 90-94 
A. P. Katchalov. Behavior of the roots of the equation $w'_1(z)+\sigma w_1(z)=0$. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 9, Tome 78 (1978), pp. 90-94. http://geodesic.mathdoc.fr/item/ZNSL_1978_78_a5/
@article{ZNSL_1978_78_a5,
     author = {A. P. Katchalov},
     title = {Behavior of the roots of the equation $w'_1(z)+\sigma w_1(z)=0$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {90--94},
     year = {1978},
     volume = {78},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_78_a5/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Some properties of the roots of the equation $w'_1(z)+\sigma w_1(z)=0$ when the parameter $\sigma$ is real are studied.