%0 Journal Article
%T Equa£¿£¿es diferenciais pantogr¨¢ficas: retardo proporcional
%A Paulo R. C. Ruffino
%J Mathematics
%D 2014
%I arXiv
%X We present initially the motivation, definition and basic properties of differential equations with proportional delay. In the last Section we present open problems.
%U http://arxiv.org/abs/1405.6304v1