Classif ication，Genesis and Significance of Nodular Limestone of Early Silurian in NW Sichuan
Lan Guang-zhi Zhang Ting-shan Gao Wei-dong
西南石油大学学报(自然科学版) . 1994, (3): 1 -6 .  DOI: 10.3863/j.issn.1000-2634.1994.03.001