Minimization of Tree Pattern Queries. - Sihem Amer-Yahia; SungRan Cho; Laks V. S. Lakshmanan; Divesh Srivastava (SIGMOD Conference, 2001)

Tree Pattern Relaxation. - Sihem Amer-Yahia; SungRan Cho; Divesh Srivastava (EDBT, 2002)

Optimizing the Secure Evaluation of Twig Queries. - SungRan Cho; Sihem Amer-Yahia; Laks V. S. Lakshmanan; Divesh Srivastava (VLDB, 2002)

Tree pattern query minimization. - Sihem Amer-Yahia; SungRan Cho; Laks V. S. Lakshmanan; Divesh Srivastava (VLDB J., 2002)

LockX: A System for Efficiently Querying Secure XML. - SungRan Cho; Sihem Amer-Yahia; Laks V. S. Lakshmanan; Divesh Srivastava (SIGMOD Conference, 2003)

MIX: A Meta-data Indexing System for XML. - SungRan Cho; Nick Koudas; Divesh Srivastava (VLDB, 2005)

Indexing for XML Siblings. - SungRan Cho (WebDB, 2005)

T-SIX: An Indexing System for XML Siblings. - SungRan Cho (WebDB, 2005)

Meta-data indexing for XPath location steps. - SungRan Cho; Nick Koudas; Divesh Srivastava (SIGMOD Conference, 2006)

Optimizing Tree Pattern Queries over Secure XML Databases. - Wendy Hui Wang; Divesh Srivastava; Laks V. S. Lakshmanan; SungRan Cho; Sihem Amer-Yahia (Secure Data Management in Decentralized Systems, 2007)

Order-preserving optimization of twig queries with structural preferences. - SungRan Cho; Wolf-Tilo Balke (IDEAS, 2008)

Relaxing XML Preference Queries for Cooperative Retrieval. - SungRan Cho; Wolf-Tilo Balke (ICEIS, 2009)

Efficient Evaluation of Preference Query Processes Using Twig Caches. - Wolf-Tilo Balke; SungRan Cho (RCIS, 2009)

Building an efficient preference XML query processor. - SungRan Cho; Wolf-Tilo Balke (SAC, 2009)