Stellar population synthesis of post-AGB stars: the s-process in MACHO 47.2496.8 A. Bonačić Marinović, M. Lugaro, M. Reyniers and H. Van Winckel A&A, 472 1 (2007) L1-L4 Published online: 17 July 2007 DOI: 10.1051/0004-6361:20078055