Wijaya, N. A., N. Wijayati, and E. Cahyono. “Catalytic Activity of Zr4+/ZA on The Isomerization Reaction of α-Pinene and It’s Reusability Test”. Indonesian Journal of Physics and Nuclear Applications, vol. 1, no. 3, Oct. 2016, pp. 157-65, doi:10.24246/ijpna.v1i3.157-165.