Merle Randall; Mikkel Frandsen (1932). «The standard electrode potential of iron and the activity coefficient of ferrous chloride». J. Am. Chem. Soc. 54 (1): 47–54. doi:10.1021/ja01340a006
Merle Randall; Mikkel Frandsen (1932). «Determination of the free energy of ferrous hydroxide from measurements of electromotive force». J. Am. Chem. Soc. 54 (1): 40–46. doi:10.1021/ja01340a005