Widyastuti, et al. “OPTIMATION OF RHENIUM-OXO-GLUCONATE SYNTHESIS AS A PRECURSOR FOR SYNTHESIS OF RHENIUM (V)-TETROFOSMIN”. Jurnal Sains Materi Indonesia, vol. 16, no. 4, July 2015, pp. 148-53, doi:10.17146/jsmi.2015.16.4.4217.