Georgy A. Molkov. Indeclinable participles in early Old Russian Gospel manuscripts
RJANO. 2017. № 2 (34), Pages. 180 - 193

Anna S. Kuleva. Short-form adjectives and participles through the prism of an author's dictionary (working on the Dictionary of the Russian Poetic Language of XXth c.)
RJANO. 2012. № 2 (24), Pages. 167 - 185