Lilis Karlina, et al. “Viability Of Robusta Coffee (Coffea Canephora) Seeds At Several Concentrations And Duration Of Giberelin (Ga3)”. Jurnal Riset Perkebunan, vol. 4, no. 1, Mar. 2023, pp. 35-44, doi:10.25077/jrp.4.1.35-44.2023.