Jacintho, A. O., and N. A. da Glória. 1976. “ The Cobalt Determination in Plant Material by the Spectrophotomeeric Method of the 2,2,-Dipyridyl Ketoxime ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz 33 (January): 55-66. https://doi.org/10.1590/S0071-12761976000100004.