1. Balmer G. G. (1949). “Shearing strength of concrete under high triaxial stresses—computation of Mohr's envelope as a curve.” Struct. Res. Lab. Rep. No. SP-23 U.S. Bureau of Reclamation Washington D.C.
2. Base G. D. (1961). “Tests on a particular design of reinforced concrete rocker bearing for motorway bridges.” Tech. Rep. TRA/351 Cement and Concrete Assoc. London England.
3. “Building code requirements for reinforced concrete.” (1989). ACI 318-89 Committee 318 Am. Concrete Inst. (ACI) Detroit Mich.
4. Haroun M. A. Pardeon G. C. and Shepard R. (1993). “Shear strength of pinned columns.” Proc. 2nd Annu. Seismic Res. Workshop Calif. Dept. of Transp. Sacramento Calif.
5. Jiang Y. and Saiidi M. (1993). “Behavior design and retrofit of reinforced concrete one-way bridge column hinges.” Rep. No. CCEER-93-1 D. N. O'Connor ed. Civ. Engrg. Dept. Univ. of Nevada Reno Nev.