The Impact of Spelling Errors on Patent Search Benno Stein author Dennis Hoppe author Tim Gollub author 2012-04 text Proceedings of the 13th Conference of the European Chapter of the Association for Computational Linguistics Walter Daelemans editor Association for Computational Linguistics Avignon, France conference publication stein-etal-2012-impact https://aclanthology.org/E12-1058/ 2012-04 570 579