Errstum for the paper
T.H. Koornwinder, The Askey scheme as a four-manifold with corners,
Ramanujan J. 20 (2009), 409--439; arXiv:0909.2822v2 [math.CA].

In §2 there is, concerning formula (2.3), a reference to Palamà [20]. However,
in the list of references, [20] should be replaced by the relevant paper:

20. Palamà, G.: Sulla soluzione polinomiale della
$(a_1 x+a_0)y''+(b_1 x+b_0)y'-n b_1 y=0$ (Italian).
Boll. Unione Mat. Ital., II. Ser. \textbf{1}, 27--35 (1939).