@article{article08fc1223,
title   = {Modelling heterogeneities in individual frailties in epidemic models},
author = {Coutinho, Francisco Antônio Bezerra and Massad, Eduardo and Lopez, Luis Fernandez and Burattini, Marcelo Nascimento and Struchiner, Claudio J. and Azevedo Neto, Raymundo Soares de},
year = {1999},
doi = {10.1016/s0895-7177(99)00119-3},
journal   = {Mathematical and Computer Modelling}
}