XML-based retrieval of object-oriented frameworks. - Sangdon Lee; Han Suk Choi; Youngjong Yang; Sangduck Lee (SMC, 2000)

An Approach to Extension of UML 2.0 for Representing Variabilities. - You-Hee Choi; Gyu-Sang Shin; Youngjong Yang; Changsoon Park (ACIS-ICIS, 2005)

An Extension of UML 2.0 for Representing Variability on Product Line Architecture. - You-Hee Choi; Seokjin Yoon; Gyu-Sang Shin; Youngjong Yang (IASTED Conf. on Software Engineering, 2006)