Efficient Computation of Expectations under Spanning Tree Distributions Ran Zmigrod author Tim Vieira author Ryan Cotterell author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zmigrod-etal-2021-efficient-computation 10.1162/tacl_a_00391 https://aclanthology.org/2021.tacl-1.41/ 2021 9 675 690