Your search returned the following 2 documents:

2. Basic analytic combinatorics of directed lattice paths
   Cyril Banderier and Philippe Flajolet
   Theoretical Computer Science 281 (1-2): 37-80, 2002
   
1. Generating Functions for Generating Trees
   Cyril Banderier, Mireille Bousquet-Mélou, Alain Denise, Philippe Flajolet, Danièle Gardy, and Dominique Gouyou-Beauchamps
   Discrete Mathematics 246: 29-55, 2002