Journal “Functional Differential Equations” is destined for the publication of high quality mathematical papers in the area of functional differential equations. Emphasis are placed on important developments in abstract and applied functional differential equations involving boundary value problems, optimization and control theory, stability theory, oscillation and nonoscillation, variational problems, differential equations with impulses, integro-differential equations, difference and functional equations, theory of partial and ordinary differential equations. Journal “Functional Differential Equations” is only one in the world where the theory of these equations is the main area of the journal.

The refereeing is done by anonymous reviewers. Only scientific quality of the papers were the criterion for publication.

The refereeing is done by anonymous reviewers. Only scientific quality of the papers were the criterion for publication. Journal “Functional Differential Equations” is only one in the world where the theory of these equations is the main area of the journal.

The journal was established by Professor Michael Drakhlin in Ariel University in 1993.

Editors-in-Chief :

Prof. Alexander Domoshnitsky, Ariel University, Ariel, Israel, adom@ariel.ac.il

Dr. Elena Litsyn, Ben Gurion University of the Negev, Beer-Sheva, Israel, elitsyn@gmail.com

### Vol 24, No 3-4 (2017)

### Table of Contents

#### Articles

Positive periodic solutions with two parameters of coupled functional differential systems | |

S. Padhi, P. Kar, S. Pati | p.87–93 |

Oscillation results of fourth order non-linear neutral differential equations with quasi-derivatives | |

S. Panigrahi, R. Basu | p.95–110 |

Impulsive problems and distributional differential equations | |

I. Rachunkova, J. Tomecek | p.111–126 |

Asymptotic properties of solutions in Marchuk’s basic model of disease | |

M. Skvortsova | p.127–135 |

Periodic solutions for an equation governing dynamics of a renewable resource subjected to additive Allee effects in a seasonally varying environment | |

P. Srinivasu, K. Gurubilli, B. Misganaw | p.137–155 |

Spherical Polyharmonic Equation | |

V. Vaskevich | p.157–166 |

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