Geodesic
Nonnegative point spectrum for differential equations with infinite delays
Portugaliae mathematica, Tome 40 (1981) no. 2, pp. 239-251

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Keywords: first order differential equation, linear retarded functional differential equation, infinite delay 
Ferreira, José M. Nonnegative point spectrum for differential equations with infinite delays. Portugaliae mathematica, Tome 40 (1981) no. 2, pp. 239-251. http://geodesic.mathdoc.fr/item/PORMA_1981__40_2_115447/
@article{PORMA_1981__40_2_115447,
     author = {Ferreira, Jos\'e M.},
     title = {Nonnegative point spectrum for differential equations with infinite delays},
     journal = {Portugaliae mathematica},
     pages = {239--251},
     year = {1981},
     volume = {40},
     number = {2},
     mrnumber = {0819888},
     zbl = {0584.34049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_2_115447/}
}
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