Bis-indolylmethane Derivatives as A Potential Colorimetric Sensor for Chromium Ion Detection in Water. BEAM [Internet]. 2024 Sep. 30 [cited 2025 Jan. 9];3(Special Issue (ICo-ASCNITech 2024):10-6. Available from: https://beam.pmu.edu.my/index.php/beam/article/view/182