A classification of plane and planar 2-trees. - Gilbert Labelle; Cédric Lamathe; Pierre Leroux (Theor. Comput. Sci., 2003)

A shifted asymmetry index series. - Gilbert Labelle; Cédric Lamathe (Adv. Appl. Math., 2004)

Even permutations and oriented sets: their shifted asymmetry index series. - Gilbert Labelle; Cédric Lamathe (Adv. Appl. Math., 2004)

Labelled and unlabelled enumeration of k-gonal 2-trees. - Gilbert Labelle; Cédric Lamathe; Pierre Leroux (J. Comb. Theory A, 2004)

Enumeration of solid 2-trees according to edge number and edge degree distribution. - Michel Bousquet; Cédric Lamathe (Discret. Math., 2005)

On Symmetric Structures of Order Two. - Michel Bousquet; Cédric Lamathe (Discret. Math. Theor. Comput. Sci., 2008)