1. Complexes of iron(II), cobalt(III), and nickel with pyridine-2-aldehyde thiosemicarbazone;Ablov;Russ. J. Inorg. Chem,1969
2. Practical Physical Chemistry;James,1967
3. Colorimetric Determination of Traces of Metals;Sandell,1969
4. Complexometric Titrations;Schwarzenbach,1969