IPHAS and the symbiotic stars - I. Selection method and first discoveries R. L. M. Corradi, E. R. Rodríguez–Flores, A. Mampaso, R. Greimel, K. Viironen, J. E. Drew, D. J. Lennon, J. Mikolajewska, L. Sabin and J. L. Sokoloski A&A, 480 2 (2008) 409-419 Published online: 02 January 2008 DOI: 10.1051/0004-6361:20078989