<Li> (in English) M.L. Perkins, "The Crisis of Sensationalism in Diderot's Lettre sur les aveugles," Studies on Voltaire and the Eighteenth Century, 1978, n ° 174, pp. 167--88 . </Li> <Li> (in English) Christine M. Singh, "The Lettre sur les aveugles: Its Debt to Lucretius," Studies in Eighteenth - Century French Literature, Exeter, Univ. of Exeter, 1975, pp. 233--42 . </Li>

Who wrote lettre sur les aveugles what was the author critiquing in the book