1
by Padhi, Seshadev, Graef, John R., Srinivasu, P. D. N.
Published 2014
Springer India
... and researchers in the field of differential equations with applications to biology, ecology, and the environment...

2
by Graef, John R., Henderson, Johnny, Ouahab, Abdelghani
Published 2013
De Gruyter
... in modeling impulsive problems in physics, population dynamics, ecology, biotechnology, industrial robotics...