1) 上田, 福田, 中長, 円道 : 残留応力の有限要素法に基づく測定原理と推定値の信頼性, 日本造船学会論文集, 第138号 (1975), pp.525-533.および, Fundamental Concept in Measurement of Residual Stresses Based on Finite Element Method and Reliability of Estimated Values, THEORETICAL AND APPLIED MECHANICS, University of Tokyo Press, Vol. 25 (1977), pp. 539-554.
2) C. R. Rao and S. K. Mitra : Generalized Inverse of Matrices and its Applications, John Wiley & Sons, New York (1971).