Toint, Philippe; Yuan, Ya-Xiang Preface: To the special issue dedicated to Professor Michael J. D. Powell on the occasion of his 70th birthday. (English) Zbl 1148.01313 Optim. Methods Softw. 23, No. 2, 175-176 (2008). MSC: 01A70 Biographies, obituaries, personalia, bibliographies Keywords:Dedication Biographic References: Powell, Michael J. D. PDFBibTeX XMLCite \textit{P. Toint} and \textit{Y.-X. Yuan}, Optim. Methods Softw. 23, No. 2, 175--176 (2008; Zbl 1148.01313) Full Text: DOI