@article{704e2ab1ac794fe6a71d097202d22c60,
title = "Multiloop modular invariance in spontaneously broken superstrings",
abstract = "The proof of modular invariance for a recently constructed class of four-dimensional superstrings exhibiting spontaneous breakdown of space-time supersymmetry is extended to any loop order.",
author = "S. Ferrara and C. Kounnas and M. Porrati",
note = "Funding Information: ~r This work is supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics of the United States Department of Energy under Contract ~DE-AC03-76SF00098,b y the Department of Energy under Grant #DE-AA03-76SF00034, and by the National Science Foundation under Grant #PHY8117447. Address as from 1 October 1987: University of California, Berkeley, CA 94720, USA.",
year = "1987",
month = oct,
day = "22",
doi = "10.1016/0370-2693(87)90356-X",
language = "English (US)",
volume = "197",
pages = "135--138",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier B.V.",
number = "1-2",
}