@article{CRPHYS_2005__6_2_185_0,
     author = {Nathan Berkovits},
     title = {Covariant multiloop superstring amplitudes},
     journal = {Comptes Rendus. Physique},
     pages = {185--197},
     publisher = {Elsevier},
     volume = {6},
     number = {2},
     year = {2005},
     doi = {10.1016/j.crhy.2004.12.009},
     language = {en},
}