Photometric study of the close binary system DD Monocerotis Shengbang Qian, Qingyao Liu, Yulan Yang, Shenghong Gu and Zhangkui Huang Astron. Astrophys. Suppl. Ser., 125 3 (1997) 475-478 Published online: 15 November 1997 DOI: 10.1051/aas:1997235