%0 Journal Article %T On new approaches to the study of nanosystems %A N. N. Trunov %J Physics %D 2013 %I arXiv %X Quantum nanosystems are exremely diverse and often very complicated. That is why new methods of a simple description of such systems ensuring the retention of essential part of information at small numbers of parameters are needed. We consider several approaches to such reduced description. Besides we warn against using of one new incorrect approach. %U http://arxiv.org/abs/1302.6016v1