Refactoring Use Case Models: The Metamodel. - Kexing Rui; Gregory Butler (ACSC, 2003)

Refactoring Use Case Models: A Case Study. - Kexing Rui; Shengbing Ren; Gregory Butler (ICEIS (3), 2003)

Refactoring the Scenario Specification: A Message Sequence Chart Approach. - Shengbing Ren; Kexing Rui; Gregory Butler (OOIS, 2003)

Use Case Refactoring: A Tool and a Case Study. - Jian Xu; Wei Yu; Kexing Rui; Gregory Butler (APSEC, 2004)

A Prototype Tool for Use Case Refactoring. - Shengbing Ren; Gregory Butler; Kexing Rui; Jian Xu; Wei Yu; Renhang Luo (ICEIS (3), 2004)