"These observations, which form the basis for the current book, are the essence of
an article that predates this book, written way back in 1984, by Roger Ibbotson,
Jeffrey Diermeier (then, at Brinson Partners, and now, the Diermeier Family ..."
Proceedings of SPIE Earth Observing Systems XIV : 3-5 August 2009, San Diego, California, United States 7452 by James J. Butler , Xiaoxiong Xiong , Xingfa Gu 380 Pages, Published 2009 by Spie-International Society For Optical Engineering ISBN-13: 978-0-8194-7742-2, ISBN: 0-8194-7742-7
Earth Observing Systems XI 14-16 August, 2006, San Diego, California, USA (Proceedings of SPIE) by James J. Butler , Jack Xiong Hardcover, 1 Pages, Published 2006 by Spie-International Society For Optical Engine ISBN-13: 978-0-8194-6375-3, ISBN: 0-8194-6375-2
Proceedings of SPIE Earth Observing Systems XII : 26-28 August 2007, San Diego, California, USA 6677 by James J. Butler , Jack Xiong Paperback, 612 Pages, Published 2007 by Spie Press ISBN-13: 978-0-8194-6825-3, ISBN: 0-8194-6825-8