Pinto-Santamaría, Gladys Cristina, et al. “Use of Ecuadorian Natural and Acid-Surfactant Modified Zeolites for Remediation of Oil- Contaminated Soils”. CT&F - Ciencia, Tecnología Y Futuro, vol. 9, no. 1, May 2019, pp. 93-104, doi:10.29047/01225383.155.