Journal Article
Ivanova, O. V.; Skorov, Y. V.; Korsun, P. P.; Afanasiev, V. L.; Blum, J.: Observations of the long-lasting activity of the distant Comets 29P Schwassmann-Wachmann 1, C/2003 WT42 (LINEAR) and C/2002 VQ94 (LINEAR). Icarus
211 (1), pp. 559 - 567 (2011)