Regularization of open superstring from orientable closed surface
Paul H. Frampton, Abhijit K. Kshirsagar, Yee Jack Ng · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1986
By tracing the one-loop annulus and M\"obius diagrams to a common origin, as integration contours on a torus, the principal-part regularization of the open superstring is given some justification. The result hints at the possibility of a simple topological expansion for open superstrings.