no. 1
Asymptotic stability for a homogeneous singularly perturbed system of differential equations with unbounded delay
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 97-116. 
@article{AFST_1993_6_2_1_97_0,
     author = {Dimitrov Voulov, Hristo and Dimitrov Bainov, Drumi},
     title = {Asymptotic stability for a homogeneous singularly perturbed system of differential equations with unbounded delay},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {97--116},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 2},
     number = {1},
     year = {1993},
     mrnumber = {1230707},
     zbl = {0772.34054},
     language = {en},
     url = {http://archive.numdam.org/item/AFST_1993_6_2_1_97_0/}
}
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Dimitrov Voulov, Hristo; Dimitrov Bainov, Drumi. Asymptotic stability for a homogeneous singularly perturbed system of differential equations with unbounded delay. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 97-116. http://archive.numdam.org/item/AFST_1993_6_2_1_97_0/

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