Journal of Hebei University (Natural Science Edition) ›› 2006, Vol. 26 ›› Issue (5): 460-462,468.DOI: 10.3969/j.issn.1000-1565.2006.05.004

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Number of Arrangements of Open Semicircles

LI Ying-zi,YANG Ge,MENG Zhao-jing   

  • Online:2006-09-25 Published:2006-09-25

CLC Number: