Geodesic
Positive solutions of functional differential equations
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 73-74 
A. S. Larionov. Positive solutions of functional differential equations. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 73-74. http://geodesic.mathdoc.fr/item/VUU_2008_2_a25/
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     title = {Positive solutions of functional differential equations},
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     pages = {73--74},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The sufficient conditions for existence of positive solutions are presented for some class of differential equations with deviating argument. These conditions have been obtained on the basis of reduction of Cauchy problem for the given differential equation to the equation with a monotone operator.

[1] Azbelev N. V., Rakhmatullina L. F., “K voprosu o funktsionalno-differentsialnykh neravenstvakh i monotonnykh operatorakh”, Funkts.-differents. uravneniya, Izd-vo Perm. politekh. in-ta, Perm, 1986, 3–9 | MR

[2] Azbelev N. V., Maksimov V. P., Rakhmatullina L. F., Vvedenie v teoriyu funktsionalno-differentsialnykh uravnenii, Nauka, M., 1991 | MR | Zbl