IUTAM Symposium on asymptotic methods for turbulent shear flows at high Reynolds numbers : proceedings of the IUTAM Symposium held in Bochum, Germany, June 28-30 1995 / ed. by K. GerstenIUTAM symposium on dynamics of slender vortices : proceedings of the IUTAM symposium held in Aachen, Germany, 31 August-3 September 1997 / ed. by E. Krause and K. Gersten