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Cole, R., Buchenroth-Martin, C., Weston, T., Devine, L., Myatt, J., Helding, B., Pradhan, S., McKeown, M., Messier, S., Borum, J., & Ward, W. (2018). one-on-one and small group conversations with an intelligent virtual science tutor. Computer speech & language, 50, 157–174. http://access.bl.uk/ark:/81055/vdc_100058430048.0x00001b