Incidence algebras by Spiegel, Eugene, O'Donnell, Christopher J. fromMonographs and textbooks in pure and applied mathematics 0 Type: Book
Galvin's "racing pawns" game and a well-ordering of trees by Grantham, Stephen B. fromMemoirs of the American Mathematical Society 0 Type: Book
Ordered sets: an introduction with connections from combinatori… by Schroder, Bernd S. W. 0 Type: Book
