Yoshinori Hijikata, Hideki Hashimoto, Shogo Nishida. Search Mathematical Formulas by Mathematical Formulas. In Michael J. Smith, Gavriel Salvendy, editors, Human Interface and the Management of Information. Designing Information Environments, Symposium on Human Interface 2009, Held as Part of HCI International 2009, San Diego, CA, USA, July 19-24, 2009, Procceedings, Part I. Volume 5617 of Lecture Notes in Computer Science, pages 404-411, Springer, 2009. [doi]