1. Ambitwistor strings and the scattering equations;Mason;J. High Energy Phys.,2014
2. Factorization of chiral string amplitudes;t. Huang;J. High Energy Phys.,2016
3. Chiral closed strings: four massless states scattering amplitude;Leite;J. High Energy Phys.,2017
4. On the null origin of the ambitwistor string;Casali;J. High Energy Phys.,2016