@book{ BA9018684X, author = "Air Force Conference on Matrix Methods in Structural Mechanics and Air Force Flight Dynamics Laboratory (U.S.) and Air Force Institute of Technology (U.S.)", title = "Proceedings of the third Conference on Matrix Methods in Structural Mechanics : proceedings of the conference held at Wright-Patterson Air Force Base, Ohio 19-21 October 1971", publisher = "Wright-Patterson Air Force Base", year = "1973", URL = "https://ci.nii.ac.jp/ncid/BA9018684X" }