The multiperiodic δ Scuti star 4 Canum Venaticorum: 1997 APT photometry M. Breger and F. Hiesberger Astron. Astrophys. Suppl. Ser., 135 3 (1999) 547-553 Published online: 15 March 1999 DOI: 10.1051/aas:1999187