Defect solitons in nonlinear optical lattices with parity-time symmetric Bessel potentials Hongcheng Wang, Dongxiong Ling, Guihua Chen, Xing Zhu and Yingji He Eur. Phys. J. D, 69 1 (2015) 31 Published online: 27 January 2015 DOI: 10.1140/epjd/e2014-50668-2