Dp. Sorokin et M. Tonin, ON THE CHIRAL FERMIONS IN THE TWISTOR-LIKE FORMULATION OF D = 10 HETEROTIC STRING, Physics letters. Section B, 326(1-2), 1994, pp. 84-88
An n = 8 worldsheet superfield action is proposed for describing chira
l fermions in the twistor-like formulation of an N = 1, D = 10 heterot
ic superstring.