Mantuano, J. L. S., Macías, M. E. V., Toapanta, E. S. S., Palma, K. S. T., & Giraldo, M. F. V. (2020). Obtaining biogas product from biological residues vaccines in Chone city. International Journal of Physical Sciences and Engineering, 4(1), 21–28. https://doi.org/10.29332/ijpse.v4n1.416