Chemical abundances of the PRGs UGC 7576 and UGC 9796 - I. Testing the formation scenario M. Spavone, E. Iodice, M. Arnaboldi, G. Longo and O. Gerhard A&A, 531 (2011) A21 Published online: 01 June 2011 DOI: 10.1051/0004-6361/201116588