X. Wang, L. Hedrich, "Structural Synthesis of Four-Quadrant Multiplier Based on Hierarchical Topology", Proc. of the Conference on Design, Automation and Test in Europe (DATE), Mar. 2008
X. Wang, L. Hedrich, "Hierarchical Symbolic Analysis of Analog Circuits Using Two-Port Networks", Proc. of 6th WSEAS international conference on circuits, systems, electronics, control and signal processing (CSECS), Dec. 2007.
X. Wang, L. Hedrich, "Hierarchical Exploration and Selection of Transistor-Topologies for Analog Circuit Design", IEEE International Symposium on Circuits and Systems (ISCAS), May 2006.
X. Wang, L. Hedrich, "An Approach to Topology Synthesis of Analog Circuits Using Hierarchical Blocks and Symbolic Analysis", Proc. Asia South Pacific Design Automation Conference (ASPDAC), Jan. 2006.