BVRI observations of dwarf novae in outburst - I. AL Comae Berenices, V544 Herculis, V660 Herculis, V516 Cygni and DX AndromedaeC. Spogli, M. Fiorucci and G. TostiAstron. Astrophys. Suppl. Ser., 130 3 (1998) 485-494DOI: https://doi.org/10.1051/aas:1998239