Enumerating permutations avoiding more than three Babson-Steingrímsson patterns. Bernini, Antonio; Pergola, Elisa — 2007 Journal of Integer Sequences [electronic only]
ECO method and hill-free generalized Motzkin paths. Barcucci, Elena; Pergola, Elisa; Pinzani, Renzo; Rinaldi, Simone — 2001 Séminaire Lotharingien de Combinatoire [electronic only]
Permutations avoiding an increasing number of length-increasing forbidden subsequences. Barcucci, Elena; Del Lungo, Alberto; Pergola, Elisa; Pinzani, Renzo — 2000 Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only]