Surveys of ultraviolet-excess quasar candidates in large fields - The area around NGC 450E. Gosset, O. Moreau, J. Surdej, J.-P. Swings and H. C. ArpAstron. Astrophys. Suppl. Ser., 123 3 (1997) 529-568DOI: https://doi.org/10.1051/aas:1997350