1. n-Arnye Kvazigruppy;Belousov,1972
2. N-ary quasi-groups and loops;Belousov;Sib. Mat. Zh.,1966
3. Quandle cohomology and state-sum invariants of knotted curves and surfaces;Carter;Trans. Am. Math. Soc.,2003
4. Geometric interpretations of quandle homology;Carter;J. Knot Theory Ramif.,2001
5. Knotted Surfaces and Their Diagrams;Carter,1998