Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71R. Sagar, Gopal-Krishna, V. Mohan, A. K. Pandey, B. C. Bhatt and S. J. WagnerAstron. Astrophys. Suppl. Ser., 134 3 (1999) 453-461DOI: https://doi.org/10.1051/aas:1999149