Yudiwati, R., Pramesti, M., Agustinus, A., Pradana, E., & Purwanto, B. (2017). IMPACT OF PREPARATION USING CONVENTIONAL AND MODIFIED DENSITY GRADIENT CENTRIFUGATION METHODS ON SPERM CONCENTRATION, MOTILITY AND NUMBER OF NORMAL MOTILE SPERM RECOVERY (NMSR). Folia Medica Indonesiana, 53(3), 196–198. https://doi.org/10.20473/fmi.v53i3.6447