Shockley, W. and Pearson, G. L., and Haynes, J. R. (1949). "Hole injection in germanium – Quantitative studies and filamentary transistors". Bell System Technical Journal. 28 (3): 344–366. doi:10.1002/j.1538-7305.1949.tb03641.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)