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Jacobs,\nThe shape and term structure of the index option smirk: Why multifactor stochastic volatility models work so well,\nManagement Sci. 55 (2009), no. 12, 1914\u20131932.","DOI":"10.1287\/mnsc.1090.1065"},{"key":"2024022618254306241_j_mcma-2023-2021_ref_008","unstructured":"E. Derman,\nRegimes of volatility: Some observations on the variations of S&P 500 implied volatilities,\nGoldman Sachs Quantitative Strategy Papers, 1999."},{"key":"2024022618254306241_j_mcma-2023-2021_ref_009","doi-asserted-by":"crossref","unstructured":"C. Emmanuel and X. Mao,\nTruncated EM numerical method for generalised Ait\u2013Sahalia-type interest rate model with delay,\nJ. Comput. Appl. Math. 383 (2021), Paper No. 113137.","DOI":"10.1016\/j.cam.2020.113137"},{"key":"2024022618254306241_j_mcma-2023-2021_ref_010","doi-asserted-by":"crossref","unstructured":"M. B. Giles, D. J. Higham and X. 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