Stellar and circumstellar activity in the 'BE' star EW lac from the multi-site 1993 campaign - Hubert, A. M.; Floquet, M.; Hirata, R.; McDavid, D.; Zorec, J.; Gies, D.; Hahula, M.; Janot-Pacheco, Eduardo; Kambe, E.; Leister, Nelson Vani; Stefl, S.; Tarasov, A. (Colloquium of the International Astronomical Union, 1999)