Here is the previous i-USEr for reference.

i-USEr 2021
i-USEr 2021 Website
i-USEr 2018 Springer Book Chapter

i-USEr 2018
i-USEr 2018 Website
i-USEr 2018 Springer Book Chapter

i-USEr 2016
i-USEr 2016 Website
i-USEr 2016 IEEE Proceedings

i-USEr 2014
i-USEr 2014 Website
i-USEr 2014 IEEE Proceedings

i-USEr 2011
i-USEr 2011 IEEE Proceedings

i-USEr 2010
i-USEr 2010 IEEE Proceedings