ruzzamanv, M. H., G. M. M. Rahman, A. S. M. Kamal, M. H. Kahil, M. A. Hossain, and A. I. Mustafa. “?SPECTROPHOTOMETRIC DETERMINATION OF PA-LLADIUM (II) WITH RUBEANIC ACID (RA) IN PRESENCE OF PYRIDINE, PIPERIDINE AND 3-PICOLINE”. Biological Sciences - PJSIR, vol. 42, no. 4, Aug. 1999, pp. 173-6, http://v2.pjsir.org/index.php/biological-sciences/article/view/2145.