A variability analysis of low-latitude unidentified gamma-ray sources D. F. Torres, G. E. Romero, J. A. Combi, P. Benaglia, H. Andernach and B. Punsly A&A, 370 2 (2001) 468-478 Published online: 15 May 2001 DOI: 10.1051/0004-6361:20010239