Konstantinos Drakakis Scott Rickard James K. Beard Rodrigo Caballero Francesco Iorio Gareth O'Brien John Walsh Results of the Enumeration of Costas Arrays of Order 27. 4684-4687 2008 54 IEEE Transactions on Information Theory 10 http://dx.doi.org/10.1109/TIT.2008.928979 db/journals/tit/tit54.html#DrakakisRBCIOW08