1. Fritzke, B.: Growing Cell Structures-A self-organizing network for unsupervised and supervised learning. Neural Networks, Vol. 7, No. 9, 1994, pp. 1441–1460.
2. Fritzke, B.: A Growing Neural Gas Network Learns Topologies. Advances in Neural Information Processing Systems, 7, MIT Press, 1995.
3. Kohonen, T.: The Adaptive-Subspace SOM (ASSOM) and its use for the implementation of invariant feature detection. Proc. Int. Conf. on Artificial Neural Networks-ICANN’ 95, Oct. 9–13, Paris, 1995.
4. Kohonen, T.: Emergence of invariant-feature detectors in the adaptive-subspace self-organizing map. Biol. Cyber. 75(4), 1996, pp. 281–291.
5. Kottow, D.: Dynamic topology for self-organizing networks based on adaptive subspaces, Master Degree Thesis, University of Chile, 1999 (Spanish).