Philippe Flajolet Éric Fusy Xavier Gourdon Daniel Panario Nicolas Pouyanne A Hybrid of Darboux's Method and Singularity Analysis in Combinatorial Asymptotics. 2006 13 Electr. J. Comb. 1 http://www.combinatorics.org/Volume_13/Abstracts/v13i1r103.html db/journals/combinatorics/combinatorics13.html#FlajoletFGPP06