"The planning of the facilities offered in the field of radio in the developing countries — Description and explanation of a plan — Technical aspects to be considered in the installation, operation and development of a radio network — Economic aspects — Population density — Assistance. [Working Paper, 24 Oct. 1962. Contribution to: The United Nations Conference on the Application of Science and Technology for the Benefit of the Less Developed Areas, Geneva, 4 to 20 February 1963. E/Conf. 39/L/54. Agenda Item: L.2]" (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 1427, topic code 231)