Nonperturbative corrections in type II string theory corresponding to Riemann surfaces with one boundary are calculated in several noncompact geometries of desingularized orbifolds. One of these models has a complicated phase structure which is explored. A general condition for integrality of the numerical invariants is discussed. © 2002 Elsevier Science B.V. All rights reserved.
Blum, J. D. (2002). Calculation of nonperturbative terms in open string models. Nuclear Physics B, 634(1–2), 3–22. https://doi.org/10.1016/S0550-3213(02)00286-9