Siriphot, David, Nattapon Pookrongtong, and Wisit Lumchanao. 2018. “Single CDCTA Based Electronically Adjustable Current-mode Quadrature Sinusoidal Oscillator”. Applied Science and Engineering Progress 11 (3):209-16. https://ph02.tci-thaijo.org/index.php/ijast/article/view/211343.