Assessing the reading level of web pages. - Sarah E. Petersen; Mari Ostendorf (INTERSPEECH, 2006)

Text simplification for language learners: a corpus analysis. - Sarah E. Petersen; Mari Ostendorf (SLaTE, 2007)

A machine learning approach to reading level assessment. - Sarah E. Petersen; Mari Ostendorf (Comput. Speech Lang., 2009)