Krizis doverija? Pojavlenie i utverženie pravovogo dokumenta v Velikom Knjažestve Litovskom (konec XIV-pervaja tretʹ XVI v.) = Crisis of trust? : Appearance and establishment of legal document in the Grand Duchy of Lithuania (end of XIVth-first third of XVIth centuries) - Hruša, Aljaksandr Ivanavič (Mediaevalia)