@article {17235,
	title = {Disk Element Model for Simulation of Failure Behavior of Concrete under Biaxial Stresses},
	journal = {Journal of Structural Engineering, JSCE},
	volume = {Vol. 42A},
	year = {1996},
	pages = {239-246},
	author = {M. A. M. Abdeen and T.  Tsubaki}
}
