@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.}
}
