Nigiyan, S. and Khondkaryan, T. (2017) “ON CANONICAL NOTION OF $\delta$-REDUCTION AND ON TRANSLATION OF TYPED $\lambda$-TERMS INTO UNTYPED $\lambda$-TERMS”, Proceedings of the YSU A: Physical and Mathematical Sciences. Yerevan, Armenia, 51(1 (242), pp. 46–52. doi: 10.46991/PYSU:A/2017.51.1.046.