“Portability of Pension, Health, and other Social Benefits: Facts, Concepts, and Issues,” by Robert Holzmann and Johannes Koettl (CESifo Working Paper No. 4002, November 2012, .pdf format, 40p.). Note: Links to the abstract and full-text can be found at:
www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_id=19071546
