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APA Citation
Ip, E. H., Strachan, T., Fu, Y., Lay, A., Willse, J. T., Chen, S., Rutkowski, L., & Ackerman, T. (2019). bias and Bias Correction Method for Nonproportional Abilities Requirement (NPAR) Tests. Journal of educational measurement, 56(1), 147–168. http://access.bl.uk/ark:/81055/vdc_100078583105.0x000058