aswolf/unbiased-pscale — pull request #6 by rongzh (2014-12-01 18:26:57+00:00)
Title: added Dewaele2004, Hemley1989, Speziale2001, Shim2002

added the 4 articles cited by Fei2007: Dewaele2004, Hemley1989, Speziale2001 and Shim2002.