%A ECIR %A Hiemstra, Djoerd %T Advances in information retrieval : 43rd European Conference on IR Research, ECIR 2021, virtual event, March 28-April 1, 2021 : proceedings %I Springer %D 2021 %S Lecture notes in computer science %V 12656 %U https://ci.nii.ac.jp/ncid/BC09653442