potassium
1963 / The Discovery of Potassium and Sodium, and the Problem of the Chemical Elements / Robert Siegfried / Isis 54 (1963) p. 247 [lien]
2000 / Devitalising the Elements: Johann Friedrich John (1782–1847) and the Liberation of Phosphorus and Potassium from a Vital Force / Theodore L. Sourkes / Ambix 47 (2000) p. 37 [doi]