RT Journal T1 SOME GEOMETRIC PROPERTIES OF STRINGS A1 SHEN Jian-min PB Communications in Theoretical Physics FD 1988-10-30 YR 1988 JF Communications in Theoretical Physics JO Communications in Theoretical Physics VO 10 IS 3 SP 347 DO K1 LK {https://ctp.itp.ac.cn/EN/article/article_14530.shtml}