MLN Gorban AN, Zinovyev A. Principal Graphs and Manifolds. In Handbook of Research on Machine Learning Applications and Trends: Algorithms, Methods and Techniques, Information Science Reference, 2009. 28-59. https://arxiv.org/abs/0809.0490 MLN Gorban AN, Sumner NR, Zinovyev A. PCA Beyond The Concept of Manifolds: Principal Trees, Metro Maps, and Elastic Cubic Complexes. In Principal Manifolds for Data Visualization and Dimension Reduction, Lecture Notes in Computational Science and Engineering 58, Springer, Berlin - Heidelberg, 2008, 219-237 https://arxiv.org/abs/0801.0176 MLN Gorban AN, Zinovyev A. Elastic Maps and Nets for Approximating Principal Manifolds and Their Application to Microarray Data Visualization. In Principal Manifolds for Data Visualization and Dimension Reduction, Lecture Notes in Computational Science and Engineering 58, Springer, Berlin - Heidelberg, 2008, 96-130 https://arxiv.org/abs/0801.0168 MLN Gorban AN, Zinovyev A. PCA and K-Means decipher genome. In Principal Manifolds for Data Visualization and Dimension Reduction, Lecture Notes in Computational Science and Engineering 58, Springer, Berlin - Heidelberg, 2008, 307-323 https://arxiv.org/abs/q-bio/0504013