No. 12 (1990)
Published: 1990-04-28
Scientific articles
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14-171990-04-28Carlos Ramírez Cardona
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18-221990-04-28Julio Alberto Rodríguez Pinzón
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37-411990-04-28Jaime Bernal Román
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46-501990-04-28Luis Gerardo Rodríguez
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54-551990-04-28Luz Marina Patiño, German Maldonado, Fanny Rodríguez de Cárdenas
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56-571990-04-28Blanca Cruz de Linares, Francoise Joachin
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