Rasid Mamat, A., Susilawati Mohamed, F., Afendee Mohamed, M., Mohd Rawi, N., & Isa Awang, M. (2018). Silhouette index for determining optimal k-means clustering on images in different color models. International Journal of Engineering & Technology, 7(2.14), 105-109. https://doi.org/10.14419/ijet.v7i2.14.11464