Discrete Mathematics - J. Saxl (1995) WW
Combinatorial Expansions for Paths, Chung-Feller Theorem and Hankel Matrix Speaker: Yeong-Nan Yeh Institute of mathemetics, Academia sinica.
Number Sense Addition and Subtraction Strategies (or, Are You Serious? No Algorithm?!) Lise Brown Caldwell Elementary.
Number Sense Addition and Subtraction Strategies (or, Are You Serious? No Algorithm?!)
Combinatorial Expansions for Paths, Chung-Feller Theorem and Hankel Matrix
