@Journal article{b1000000531729, author = "Waraczewski, Maciej", title = "Osobennosti upotrebleniâ vspomagatel'nogo glagola v formah perfekta v 1-m lice edinstvennogo čisla v drevnerusskih gramotah XIV-XVI vv. = The use of auxiliary verb in the 1st person singular perfect verbal forms in the Old Russian documents of the 14-16th centuries ", publisher = "", year = "" }