Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SONG Chang and YAMAKAWA Makoto and UETANI Koji,A CONVEX RELAXATION FORMULATION FOR MINIMUM WEIGHT DESIGN PROBLEM OF STEEL FRAME STRUCTURES,Journal of Structural and Construction Engineering (Transactions of AIJ),1340-4202,Architectural Institute of Japan,2012,77,673,369-377,https://cir.nii.ac.jp/crid/1390001205604139136,https://doi.org/10.3130/aijs.77.369