Bhaba Priyo Das and Neville Watson and Yonghe Liu, Simulation of Voltage Controlled Tunable All Pass Filter Using LM13700 OTA. journal = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2010, vol. 44(8). 1199 - 1203 [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/8924.