“Experimental Investigation of the Effect of Filled Steel Tubular with Various Sand Grains Diameters on the Buckling Behavior” (2021) Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), 43(2), pp. 324–347. doi:10.55562/jrucs.v43i2.156.