DIAMANTIKIPIOTI, A PAPAPANOU, PN MORAITAKITSAMI, A LINDHE, J and MITSIS, F, COMPARATIVE ESTIMATION OF PERIODONTAL CONDITIONS BY MEANS OF DIFFERENT INDEX SYSTEMS, Journal of Clinical Periodontology, (20), 656-661, 1993, MUNKSGAARD INT PUBL LTD, 0303-6979, 1600-051X