Nigiyan, S.A. “$ \lambda $-DEFINABILITY OF BUILT-IN McCARTHY FUNCTIONS AS FUNCTIONS WITH INDETERMINATE VALUES OF ARGUMENTS”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 53, no. 3 (250), Dec. 2019, pp. 191-02, doi:10.46991/PYSU:A/2019.53.3.191.