참고문헌
- I. Chajda and R. Halas, Algebraic properties of pre-logics, Math. Slovaca 2(2002), 157-175.
- S. S. Ahn and J. K. Yoo, On special sets in pre-logics, Honam. Math. J. 33(2011), 61-71. https://doi.org/10.5831/HMJ.2011.33.1.061
- Y. B. Jun, K. J. Lee and S. Z. Song, N-ideals of BCK/BCI-ideals, J. Chungcheong Math. Soc. 22(2009), 417-437.
- Y. H. Kim and S. S. Ahn, Deductive systems in commutative pre-logics, Honam. Math. J. 32(2010), 625-632. https://doi.org/10.5831/HMJ.2010.32.4.625