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- [25] A new almost periodic type of solutions of second order neutral delay differential equations with piecewise constant argument Science in China Series A: Mathematics, 2000, 43 : 371 - 383
- [27] A new almost periodic type of solutions of second order neutral delay differential equations with piecewise constant argument SCIENCE IN CHINA SERIES A-MATHEMATICS, 2000, 43 (04): : 371 - 383