Low energy o-Ps–o-Ps elastic scattering using a simple model Himanshu Sharma, Kiran Kumari and Sumana Chakraborty Eur. Phys. J. D, 53 2 (2009) 189-191 Published online: 26 March 2009 DOI: 10.1140/epjd/e2009-00110-1