Hill, P GKanagasabapathy, A S1979-05-012009-05-271979-05-012009-05-271979-05-01Hill PG, Kanagasabapathy AS. Improvement in laboratory performance by an interlaboratory quality control programme. Indian Journal of Medical Research. 1979 May; 69(): 853-64http://imsear.searo.who.int/handle/123456789/24980engHumansLaboratory Techniques and Procedures --standardsQuality ControlJournal Article