Undulating membrane structure under mixed extensional-shear flow S.H.J. Idziak, S.E. Welch, M. Kisilak, C. Mugford, G. Potvin, L. Veldhuis and E.B. Sirota Eur. Phys. J. E, 6 2 (2001) 139-145 Published online: 15 October 2001 DOI: 10.1007/s101890170015