Libraries, Technology and People by Michael Stephens
Some explanation to my formula can be read on my blog http://www.commissaresse.be/?p=131 (in Dutch) or on a seperate page in English: http://www.commissaresse.be/?page_id=136
Some explanation to my formula can be read on my blog http://www.commissaresse.be/?p=131 (in Dutch) or on a seperate page in English: http://www.commissaresse.be/?page_id=136