https://academic.oup.com/bioinformatics/article/34/17/i687/5093230 (Publisher version)
Togninalli, M., Roqueiro, D., Investigators, C. O., & Borgwardt, K. M. (2018). Accurate and adaptive imputation of summary statistics in mixed-ethnicity cohorts. Bioinformatics, 34(17), i687-i696. doi:10.1093/bioinformatics/bty596.