Lu and huang extended their discussion to fermionic strings and green - schwarz superstrings Lu和huang把brevik的讨论推广到玻色子开弦，费米子弦和超弦等情况。
2.
Brevik and nielsen calculated the casimir energy for the transverse oscillations of a piecewise closed bosonic string Brevik和nielsen首先计算了绝对零度条件下，分段均匀玻色子闭弦的casimir能量。
