1. Bulygina T.V. Problemy teorii morfologicheskikh modeley [Problems in the theory of morphological models]. Moscow, 1977.
2. Worth D.S. The morphology of zero affixation in Russian word formation. Voprosy jazykoznanija. 1972. No. 6. Pp. 76–84. (In Russ.)
3. Darden B.D. A new direction in generative phonology in the USA. Problemy teoreticheskoy i eksperimentalnoy lingvistiki 8. V.A. Zvegintsev (ed.). Moscow, 1977. Pp. 55–70. (In Russ.)
4. Itkin I.B. Alternating e ~ ’о in modern Russian revisited. Voprosy Jazykoznanija. 1994. Pp. 126–133. (In Russ.)
5. Itkin I.B. Russkaya morfonologiya [Russian morphophonology]. Moscow, 2007.