@article {Bertola:Duality,
	title = {The duality of spectral curves that arises in two-matrix models},
	journal = {Teoret. Mat. Fiz.},
	volume = {134},
	number = {1},
	year = {2003},
	pages = {32{\textendash}45},
	issn = {0564-6162},
	author = {Marco Bertola and B. Eynard and Kharnad, Dzh.}
}
