G.N. Khadem, Design of Riprap layer around bridge piers with Limited Allowed Scour, Ferdowsi University of Mashad, 2002 (in Persian).
 M. Shafai Bajestan, Basic Theory Practice Hydraulics of Sediment Transport, Shahid Chamran University of Ahvaz Press, 2011 (in Persian).
 A. Jalili, Effect of using netted collar on bridge piers scouring, Shahid Chamran University of Ahvaz, 2013 (in Persian).
 R. Hosseini, A. Amini, Scour depth estimation methods around pile groups, KSCE Journal of Civil Engineering, 19(7) (2015) 2144-2156.
 H. Shariati, S.R. Khodashenas, Investigation of Control Methods on Local Scouring around the Bridge Piers, Journal of Water and Sustainable Development, 1(3) (2015) 43-52 (in Persian).
 Z. Alem, Effect of netted collar on the scour of bridge abutment, Shahid Chamran University of Ahvaz, 2012 (in Persian).
 M. Hemmati, N. Gholizadeh, S. Dolatkhah, Experimental Investigation of the Effect of Diameter and Placement Level of Lattice Collars on Scour Reduction around Bridge Pier, Jornal of Irrigation Science and Engineering, 39 (2016) (4) 111-122 (in Persian).
 A.M. Zarrati, M. Nazariha, M. Mashahir, Reduction of local scour in the vicinity of bridge pier groups using collars and riprap, Journal of Hydraulic Engineering, 132(2) (2006) 154-162.
 B. Ataie-Ashtiani, A. Beheshti, Experimental investigation of clear-water local scour at pile groups, Journal of Hydraulic Engineering, 132(10) (2006) 1100-1104.
 M. Heidarpour, H. Afzalimehr, E. Izadinia, Reduction of local scour around bridge pier groups using collars, International Journal of Sediment Research, 25(4) (2010) 411-422.
 A. Amini, B.W. Melville, T.M. Ali, A.H. Ghazali, Clear-water local scour around pile groups in shallow-water flow, Journal of Hydraulic Engineering, 138(2) (2011) 177-185.
 M. Karimaee-Tabarestani, A. Zarrati, Effect of collar on time development and extent of scour hole around cylindrical bridge piers, International Journal of Engineering-Transactions C: Aspects, 25(1) (2011) 11-16.
 Y. Chiew, B. Melville, Local scour around bridge piers, Journal of Hydraulic Research, 25(1) (1987) 15-26.