Reference Label	Details
Chernick 1956	C. L. Chernick, H. A. Skinner, and I. Wadsö, Trans. Faraday. Soc. 52, 1088 (1956)
Hartley 1951	K Hartley, H. O. Pritchard, and H. A. Skinner, Trans. Faraday Soc. 47, 254 (1951)