Aggarwal, P. S.; Goswami, A. (1961). “An oxide of tervalent nickel”. The Journal of Physical Chemistry (bằng tiếng Anh). 65 (11): 2105. doi:10.1021/j100828a503. ISSN0022-3654.
Aggarwal, P. S.; Goswami, A. (1961). “An oxide of tervalent nickel”. The Journal of Physical Chemistry (bằng tiếng Anh). 65 (11): 2105. doi:10.1021/j100828a503. ISSN0022-3654.