Nainital Microlensing Survey – detection of short period Cepheids in the disk of M 31 Y. C. Joshi, D. Narasimha, A. K. Pandey and R. Sagar A&A, 512 (2010) A66 Published online: 02 April 2010 DOI: 10.1051/0004-6361/200913408