@patent {672948,
	title = {Cluster Analysis of Participant Responses for Test Generation or Teaching (2nd)},
	volume = {US 10,922,991 B2 },
	number = {U.S Patent and Trademark Office},
	year = {2021},
	edition = {United States of America},
	chapter = {US},
	abstract = {Textual responses to open-ended (i.e., free-response) items provided by participants (e.g., by means of mobile wireless devices) are automatically classified, enabling an instructor to assess the responses in a convenient, organized fashion and adjust instruction accordingly.},
	author = {Gary King and Lukoff, Brian and Eric Mazur}
}
