@article {Bertola:DifferentialCMP,
	title = {Differential systems for biorthogonal polynomials appearing in 2-matrix models and the associated Riemann-Hilbert problem},
	journal = {Comm. Math. Phys.},
	volume = {243},
	number = {2},
	year = {2003},
	pages = {193{\textendash}240},
	issn = {0010-3616},
	author = {Marco Bertola and B. Eynard and Harnad, J.}
}
@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.}
}
@article {Bertola:DualityCMP,
	title = {Duality, biorthogonal polynomials and multi-matrix models},
	journal = {Comm. Math. Phys.},
	volume = {229},
	number = {1},
	year = {2002},
	pages = {73{\textendash}120},
	issn = {0010-3616},
	author = {Marco Bertola and B. Eynard and Harnad, J.}
}
