Possibly interacting Vorontsov-Vel'yaminov galaxies - I. Observations of VV 432, VV 543 and VV 747A. V. Zasov, A. Y. Kniazev, S. A. Pustilnik, A. G. Pramsky, A. N. Burenkov, A. V. Ugryumov and J.-M. MartinAstron. Astrophys. Suppl. Ser., 144 3 (2000) 429-439DOI: https://doi.org/10.1051/aas:2000106