Defected structural modulation in the charge density wave compounds 1T-TaS2 and 1T-TaSe2 G. Salvetti, C. Roucau, R. Ayroles, H. Mutka et P. Molinié J. Physique Lett., 46 11 (1985) 507-511 DOI: 10.1051/jphyslet:019850046011050700