1. Matrix formulation of structural stability problem;Hartz;J. Struct. Div., ASCE,1965
2. Elastic stability of tapered I-beams;Kitipornchai;J. Struct. Div., ASCE,1972
3. Elastic stability of tapered beam-columns;Culver;J. Struct. Div., ASCE,1968
4. Design of tapered members;Lee;WRC Bulletin,1972