Confidence limits of evolutionary synthesis models - III. On time-integrated quantities M. Cerviño, M. A. Gómez-Flechoso, F. J. Castander, D. Schaerer, M. Mollá, J. Knödlseder and V. Luridiana A&A, 376 2 (2001) 422-433 Published online: 15 September 2001 DOI: 10.1051/0004-6361:20011027