Lin-Chuan Tsai Kuo-Chih Chu Design of Band-Stop Filters Using Discrete-Time Domain Techniques. 3899-3903 2008 91-B IEICE Transactions 12 http://dx.doi.org/10.1093/ietcom/e91-b.12.3899 db/journals/ieicet/ieicet91b.html#TsaiC08a