Ruiz Ortega, Esther2009-07-242009-07-241992London School of Economics and Political Science, 1992, p. 39https://hdl.handle.net/10016/4872ESRC Econometric Study Group Conference Bristol, 1992text/htmlengVariance modelsQuasi-Maximum likelihood estimation of stochastic variance modelsconference paperEstadÃsticarestricted access