“?SPECTROPHOTOMETRIC DETERMINATION OF PA-LLADIUM (II) WITH RUBEANIC ACID (RA) IN PRESENCE OF PYRIDINE, PIPERIDINE AND 3-PICOLINE”. 1999. Biological Sciences - PJSIR 42 (4): 173-76. https://v2.pjsir.org/index.php/biological-sciences/article/view/2145.