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- [1] EXISTENCE AND PROPERTIES OF PERIODIC-SOLUTIONS OF LINEAR SINGULARLY-PERTURBED SYSTEMS OF DIFFERENTIAL-EQUATIONS WITH IMPULSE EFFECT DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1987, 40 (03): : 5 - 7
- [2] PERIODIC-SOLUTIONS OF SOME SINGULARLY-PERTURBED EQUATIONS OF THE PARABOLIC TYPE USSR COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS, 1985, 25 (02): : 182 - 186
- [3] CONSTRUCTION OF PERIODIC-SOLUTIONS OF DIFFERENTIAL-EQUATIONS WITH IMPULSE EFFECT PUBLICATIONES MATHEMATICAE-DEBRECEN, 1994, 44 (3-4): : 335 - 357
- [4] BOUNDED SOLUTIONS OF LINEAR SINGULARLY PERTURBED SYSTEMS OF DIFFERENTIAL-EQUATIONS WITH IMPULSE EFFECT DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1987, 40 (04): : 23 - 26