@article{article7cf2a90f,
title   = {Alternative models to extract asset volatility: a comparative study},
author = {Pereira, Pedro Luiz Valls and Hotta, Luiz Koodi and Souza, Luiz Alvares Rezende de and Almeida, Nuno Miguel Campos Guapo de},
year = {1999},
doi = {10.12660/bre.v19n11999.2793},
journal   = {Revista de Econometria}
}