Andrey A. Zaliznyak. Functions of the nominative flexion -a in Russian
RJANO. 2018. № 1 (35), Pages. 9 - 32

Yukiko Maruyama. On the distribution of dual forms in Russian hagiographies of the 15th century: a case study of Life of St. Stephen of Perm' and Life of St. Sergius of Radonezh
RJANO. 2011. № 1 (21), Pages. 162 - 188