bifold例句
Orbifold Gromov-Witten Theory
Orbifold resolution by D-branes
Membranes on an orbifold.
A New Cohomology Theory of Orbifold
The operator algebra of orbifold models
Strings in a Time-Dependent Orbifold
Five-branes and M-theory on an orbifold
Instability of Spacelike and Null Orbifold Singularities
Limits on extra dimensions in orbifold compactifications of superstrings
Heterotic strings in symmetric and asymmetric orbifold backgrounds
