Results of the classification of superconformal algebras in two   dimensions
  A list of superconformal chiral operator product expansion algebras with quadratic nonlinearity in two dimensions is completed on the basis of the known classification of little conformal Lie superalgebras. In addition to the previously known cases and the constructed in our previous paper exceptional $N=8$ superalgebra associated with $F(4)$, a novel exceptional $N=7$ superconformal algebra associated with $G(3)$ is found, as well as a whole family of superalgebras containing affine $\widehat{su}_2 \oplus \widehat{usp}_{2N}$. A classification scheme for quasisuperconformal algebras is also outlined. 
E.S. Fradkin and V.Ya Linetsky