Paola Criscuolo The 'home advantage' effect and patent families. A comparison of OECD triadic patents, the USPTO and the EPO. 23-41 2006 66 Scientometrics 1 http://dx.doi.org/10.1007/s11192-006-0003-6 db/journals/scientometrics/scientometrics66.html#Criscuolo06