Chandrasekhar Boyapati Barbara Liskov Liuba Shrira Chuang-Hue Moh Steven Richman Lazy modular upgrades in persistent object stores. 403-417 2003 conf/oopsla/2003p OOPSLA http://doi.acm.org/10.1145/949305.949341 db/conf/oopsla/oopsla2003p.html#BoyapatiLSMR03