(Sr/Ca)14Cu24O41 spin ladders studied by NMR under pressure Y. Piskunov, D. Jérome, P. Auban-Senzier, P. Wzietek, C. Bourbonnais, U. Ammerhal, G. Dhalenne and A. Revcolevschi Eur. Phys. J. B, 24 4 (2001) 443-456 Published online: 15 December 2001 DOI: 10.1007/s10051-001-8697-y