Microchemical Journal Volume 25, Issue 1, March 1980, Pages 8-13
Spectrophotometric determination of vanadium(V) as a mixed thiocyanate-4-pyridone complex
B. Tamhina, V. Vojković and M.J. Herak
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http://dx.doi.org/10.1016/0026-265X(80)90238-6