doing a quick survey, I found these articles I send attached. Not sure if it is exactly what you were looking for though. Also, there is this link that may be of your interest: http://onlinelibrary.wiley.com/doi/10.1111/j.1574-6968.1985.tb01181.x/abstract;jsessionid=1024E65E41D01D7F74ED79154BD6FC86.f04t01?deniedAccessCustomisedMessage=&userIsAuthenticated=false