@inbook {1997,
	title = {Functionals of the Peierls - Fr{\"o}hlich Type and the Variational Principle for the Whitham Equations},
	booktitle = {Solitons, geometry, and topology : on the crossroad / V. M. Buchstaber, S. P. Novikov editors.- Providence : American Mathematical Society, 1997. - ( American mathematical society translations. Series 2. - vol. 179). - pages : 35-44},
	number = {American mathematical society translations. Series 2.;v.179},
	year = {1997},
	publisher = {American Mathematical Society},
	organization = {American Mathematical Society},
	isbn = {0821806661},
	url = {http://hdl.handle.net/1963/6485},
	author = {Boris Dubrovin}
}
