Simple formulas for lattice paths avoiding certain periodic staircase boundaries. - Robin J. Chapman; Timothy Y. Chow; Amit Khetan; David Petrie Moulton; Robert J. Waters (J. Comb. Theory A, 2009)

Circular choosability is rational. - Tobias Müller 001; Robert J. Waters (J. Comb. Theory B, 2009)

Solution to a problem of Nicolas Lichiardopol. - Adam R. Philpotts; Robert J. Waters (Discret. Math., 2010)