We show that the planar orthogonal polynomials with $l$ logarithmic singularities in the potential are the multiple orthogonal polynomials (Hermite-Pad\'e polynomials) of Type II with $l$ measures.
Discontinuity in the asymptotic behavior of planar orthogonal polynomials under a perturbation of the Gaussian weight
Random matrices with external source and multiple orthogonal polynomials
Gegenbauer and other planar orthogonal polynomials on an ellipse in the complex plane
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