Density fluctuations associated with the sawtooth internal disruption J. Andreoletti, C. Laviron, J. Olivain, A. L. Pecquet, F. Gervais, D. Gresillon, P. Hennequin, A. Quemeneur and A. Truc J. Phys. III France, 1 9 (1991) 1529-1555 DOI: 10.1051/jp3:1991209