Automatically characterizing resource quality for educational digital libraries. - Steven Bethard; Philipp G. Wetzler; Kirsten R. Butcher; James H. Martin; Tamara Sumner (JCDL, 2009)

Automatically assessing resource quality for educational digital libraries. - Philipp G. Wetzler; Steven Bethard; Kirsten R. Butcher; James H. Martin; Tamara Sumner (WICOW, 2009)

Characterizing the Quality of Resources in Educational Digital Libraries with Natural Language Processing and Machine Learning. - Philipp G. Wetzler (Bull. IEEE Tech. Comm. Digit. Libr., 2009)

Open Educational Resource Assessments (OPERA). - Tamara Sumner; Kirsten R. Butcher; Philipp G. Wetzler (Intelligent Tutoring Systems (2), 2010)

Automating open educational resources assessments: a machine learning generalization study. - Heather Leary; Mimi Recker; Andrew E. Walker; Philipp G. Wetzler; Tamara Sumner; James H. Martin (JCDL, 2011)

Characterizing and Predicting the Multifaceted Nature of Quality in Educational Web Resources. - Philipp G. Wetzler; Steven Bethard; Heather Leary; Kirsten R. Butcher; Soheil Danesh Bahreini; Jin Zhao; James H. Martin; Tamara Sumner (ACM Trans. Interact. Intell. Syst., 2013)