Name:

Romero

First name:

Sael

E-mail:

sromero@sucre.udo.edu.ve

Institution:

Departamento de Matemáticas, Universidad de Oriente

Address:

Cerro Colorado, Cumaná 6101, Venezuela

Fax:

58 293 4302123

Phone:

58 293 4519375

Title:

1. A delayed Holling-type I food chain model

2. Stable Periodic Orbits in the Harrison's Predator-Prey Model