@article {Cl2001, author = {Claesson, Anders}, title = {Generalized pattern avoidance}, journal = {European J. Combin.}, fjournal = {European Journal of Combinatorics}, volume = {22}, year = {2001}, number = {7}, pages = {961--971}, issn = {0195-6698}, doi = {10.1006/eujc.2001.0515}, url = {https://doi.org/10.1006/eujc.2001.0515}, }