Blanco Valencia, Xiomara Patricia, et al. “Kernel-Based Framework for Spectral Dimensionality Reduction and Clustering Formulation: A Theoretical Study”. ADCAIJ: Advances in Distributed Computing and Artificial Intelligence Journal, vol. 6, no. 1, Jan. 2017, pp. 31-40, doi:10.14201/ADCAIJ2017613140.