Kohji Hasegawa "Dual pairs on spinors cases of $\left( {C_m ,C_n } \right)$ and $\left( {C_m^{\left( 1 \right)} ,C_n^{\left( 1 \right)} } \right)$," Proceedings of the Japan Academy, Series A, Mathematical Sciences, Proc. Japan Acad. Ser. A Math. Sci. 63(10), 400-403, (1987)