1. Cooper, Joan, Donovan, Diane andSeberry, Jennifer,Latin squares and critical sets of minimal size. Australas. J. Combin.4 (1991), 113–120.
2. Cooper, Joan, Donovan, Diane andSeberry, Jennifer,Secret sharing schemes arising from latin squares. Bull. Inst. Combin. Appl.12 (1994), 33–43.
3. Curran, D andvan Rees, G. H. J.,Critical sets in latin squares. Congr. Num.22 (1978), 165–168.
4. Dawson, Ed, Donovan, Diane andOffer, Alan,Quasigroups, isotopisms and authentications schemes. (Submitted).
5. Donovan, Diane, Cooper, Joan, Nott, D. J. andSeberry, Jennifer,Latin squares: critical sets and their lower bounds. To appear in Ars Combin.