No. 7 (1989)
Published: 1989-04-28
Scientific articles
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7-141989-04-28Fernando Vela Bernatte
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23-261989-04-28Johnny Alvarez Jaramillo
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27-341989-04-28Henry Carmona Velez
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35-521989-04-28Jairo Enrique Rodríguez Hernández
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53-601989-04-28Americo Calero, Lida Calero
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61-641989-04-28Luz Mery Guevara Ch.