@article{article0a199549,
title   = {Negative variance components for non-negative hierarchical data with correlation, over-, and/or underdispersion},
author = {Oliveira, I. R. C and Molenberghs, G and Verbeke, G and Demétrio, Clarice Garcia Borges and Dias, Carlos Tadeu dos Santos},
year = {2017},
doi = {10.1080/02664763.2016.1191624},
journal   = {Journal of Applied Statistics}
}