9van Eck NJ, Waltman L, Dekker R, et al. A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. Journal of the American Society for Information Science and Technology. 2010, 61 (12) :2405 - 2416.
10Wille R. Restructuring Lattice Theory: An Approach Based on Hier- archies of Concepts//In: Proceedings of the 7th International Conference on Formal Concept Analysis. Berlin : Springer - Verlag, 2009:314 - 339.
