Geodesic
The Green--Schwarz superstring as~an~asymmetric model of~a~chiral field
Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 420-433

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A new class of two-dimensional $\sigma$-models of the Wess–Zumino type is constructed. The target manifold of these models is coset space $G\otimes G/G^-$ where supergroup $G$ is obtained by contraction from an arbitrary semi-simple Lie supergroup and $G^-$ is some abelian subgroup of translations in $G\otimes G$. It is shown that the equations of motion following from the Wess–Zumino type action of these model admit a zero-curvature representation. 
@article{TMF_1989_81_3_a6,
     author = {E. A. Ivanov and A. P. Isaev},
     title = {The {Green--Schwarz} superstring as~an~asymmetric model of~a~chiral field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {420--433},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a6/}
}
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E. A. Ivanov; A. P. Isaev. The Green--Schwarz superstring as~an~asymmetric model of~a~chiral field. Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 420-433. http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a6/