Moravcsik MJ. The classification of science and the science of classifficatin. Scientometrics 1986; 10(3-4):179-97. OCDE. Manual de Frascati: propuesta de norma práctica para encuestas de investigación y desarrollo experimental. París: OCDE, 1993. . Oslo Manual: proposed guidelines for collecting and interpreting technological innovation data. París: OCDE, 1997. . The measurement of scientific and technological activities: manual on the measurement of human resources devoted to S&T, "Camberra Manual". París: OCDE, 1995. Nisbet R. History of the idea of progress. New York: Basic Books (19-):365. Neill SD. Brookes, Popper and objetive knowledge. J Inform Sci 1982;(4):33-9. Palmer J. Scientists and information: II. Personal factors in information behaviour. J Document 1991;47(3):254-75. Spinak E. Diccionario enciclopédico de bibliometría, cienciometría e informetría. Caracas: Unesco, 1996:244. Sengupta IN. Bibliometrics, Informetrics, Scientometrics and Librametrics: an ovesifying bibliometric indicators for scientometric purposes. Scientometrics 1988;13(5-6):239-59. Spinak E. Quantitative analyses of scientific literature and their validity for judging Latin American Production. Bull Pan Am Health Organ 1995; 29(4):352-9. Rousseau R, Spinak E. Do a field list of internationally visible journals and their journal impact factors depend on the initial set of journals? A research proposal. J Document 1996; 52(4):449-56. Garfield E. Citation indexing: its theory and application in science, technology, and humanities. New York: John Wiley & Sons