@article{oai:aue.repo.nii.ac.jp:00006343,
 author = {Nozaki, Hiroshi and Suda, Sho},
 journal = {European Journal of Combinatorics},
 month = {Jan},
 note = {text, A finite set X in a complex sphere is called a complex spherical 2-code if the number of inner products between two distinct vectors in X is equal to 2. In this paper, we characterize the tight complex spherical 2-codes by doubly regular tournaments or skew Hadamard matrices. We also give certain maximal 2-codes relating to skew-symmetric D-optimal designs. To prove them, we show the smallest embedding dimension of a tournament into a complex sphere by the multiplicity of the smallest or second-smallest eigenvalue of the Seidel matrix.},
 pages = {511--518},
 title = {Complex spherical codes with two inner products},
 volume = {51},
 year = {2016}
}