GORUMUTCHU, G. P., V. N. RATNAKARAM, and K. KUMAR KATARI. “PIPERACILLIN ESTIMATION BY ION-ASSOCIATIVE COMPLEX FORMATION”. Asian Journal of Pharmaceutical and Clinical Research, Vol. 12, no. 3, Feb. 2019, pp. 159-63, doi:10.22159/ajpcr.2019.v12i3.29289.