Supplementary difference sets related to a certain class of complex   spherical 2-codes
  In this paper, we study skew-symmetric $2$-$\{v;r,k;\lambda\}$ supplementary difference sets related to a certain class of complex spherical 2-codes. A classification of such supplementary difference sets is complete for $v \le 51$. 
Makoto Araya, Masaaki Harada and Sho Suda
math.CO