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Journal Article CAUSAL MODELS AND SOURCES OF INTERACTION Get access JAMES S. KOOPMAN JAMES S. KOOPMAN 1Centro Internacional de Entrenamiento e Investigaciones MédicasApartado Aéreo 5390, Cali, Colombia. Search for other works by this author on: Oxford Academic PubMed Google Scholar American Journal of Epidemiology, Volume 106, Issue 6, December 1977, Pages 439–444, https://doi.org/10.1093/oxfordjournals.aje.a112489 Published: 01 December 1977
James S. Koopman (Thu,) studied this question.