• Recuperación de aguas seleníferas 

      Lora Silva, Rodrigo; Melo Gonzalez, Teddy; Rodriguez Gaitan, Julio (Bogotá : Universidad de Ciencias Aplicadas y Ambientales, 1998, 1998-10)
      There are in Colombia waters with certain amount of selenium, toxic for human and animáis. There waters are influenced by Solls of Villeta Formatlon type. The amaunts of selenium are very hlgh. A procedure was developped ...