Pavel V. Petrukhin. The construction ‘byti with the present participle’: the Old Russian usage and the biblical tradition
Trudy IRY RAS. 2016. № 3 (9), Pages. 179 - 207

Pavel V. Petrukhin. THE CONSTRUCTION ‘byti WITH THE PRESENT PARTICIPLEE’ IN THE Vitae OF BORIS AND GLEB (on the problem of the relationship between the Narration and the Lection)
Trudy IRY RAS. 2016. № 4 (10), Pages. 489 - 498