Media type: E-Article Title: American GARCH employee stock option valuation Contributor: León, Angel; Vaello-Sebastià, Antoni imprint: Elsevier BV, 2009 Published in: Journal of Banking & Finance Language: English DOI: 10.1016/j.jbankfin.2008.12.012 ISSN: 0378-4266 Keywords: Economics and Econometrics ; Finance Origination: Footnote: