1. PBD-closure;Abel,2007
2. Mutually orthogonal Latin squares;Abel,2007
3. The existence of large set of idempotent quasigroups of order 62;Chang;J Combin Math Combin Comput,2000
4. The spectrum for large sets of idempotent quasigroups;Chang;J Combin Des,2000
5. PBDs: Recursive constructions;Greig,2007