Before revision:  In the second part of the study, we illustrate the use of Bollinger Bands in pairs trading \mbox{%DIFAUXCMD INV2007 return duration relationship in Bollinger Bands pairs trading.
After revision:  In the second part of the study, we illustrate the use of Bollinger Bands in pairs trading and prove the existence of a specific return duration relationship in Bollinger Bands pairs trading.