BEAULA, C. ., D. . BEULA, B. SOUNDARYA, and L. . SELVAJOTHI. “HIDDEN ACTIVE CELL PHONE AND CAMERA DETECTOR”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 5, no. 2, Feb. 2019, pp. 257-61, https://ijtimes.com/index.php/ijtimes/article/view/2333.