My gratitude for those colleagues who reacted to my request!
The problem that I have no access to modern libraries in Moscow, and some papers which I need are not available in the net.
Could someone send me pdfs of Harry Falk ("Goodies for India: literacy, orality, and Vedic culture."Sonderforschungsbereichs ‘Übergänge und Spannungsfelder zwischen Mündlichkeitund Schriftlichkeit’. Hrsg. Wolfgang Raible. Tübingen: Gunter Narr. Pp. 103-120). And Fritz Staal  (1989): "The independence of rationality from literacy." Archives Européennes de Sociologie / European Journal of Sociology 30, 301-310). As well as Staal's paper on the memorizing techniques of the Nambudiri Brahmins which involve postures and mudrās, with pictures taken by the author of the article.
 
Victoria Lysenko, dr.hab.philos.
Head, Department for Oriental philosophy studies
Institute of Philosophy, Russian Academy of Sciences
Moscow, Volkhonka, 14
Professor, Russian State University for Humanities
Russia