1. A KRID , T., M ANIAR , L., O UHINOU , A. , Periodic solutions of non densely nonautonomous differential
2. equations with delay, Afr. Diaspora J. Math., 15(1)(2013), 1–18.
3. A RENDT , W., G RABOSCH , A., G REINER , G., G ROH , U., L OTZ , H.P., M OUSTAKAS , U., N AGEL , R., N EUBRANDER , B., S CHLOTTERBECK , U. , One-parameter Semigroup of Positive Operators, Springer, Berlin (1984).
4. A RINO , O., H BIB , M.L.,A IT D ADS , E., Delay Differential Equations and Applications, Mathematics, Physics and Chemistry, 205(2002).
5. B ANA ’ S , J. , On measures of non compactness in Banach spaces, Comment. Math. Univ. Carolin., 21(1)(1980), 131–143.