LAURENCE M. SOMMERS; ASSEFA MEHRETU. 1 - Trade Patterns and Trends in the African-European Trading Area: Lessons for Sub-Saharan Africa from the Era of the Lome Accords 1975-1988: by Laurence M. Sommers & Assefa Mehretu. Africa Development, v. 17, n. 2, 15 Mar.1992.