Computational and Linguistic Issues in Designing a Syntactically Annotated Parallel Corpus of Indo-European Languages. - Dag T. Haug; Marius L. Jøhndal; Hanne M. Eckhoff; Eirik Welo; Mari J. B. Hertzenberg; Angelika Müth (Trait. Autom. des Langues, 2009)

The PROIEL treebank family: a standard for early attestations of Indo-European languages. - Hanne M. Eckhoff; Kristin Bech; Gerlof Bouma; Kristine Gunn Eide; Dag Trygve Truslew Haug; Odd Einar Haugen; Marius L. Jøhndal (Lang. Resour. Evaluation, 2018)