【作者(必填)】
B. Davvaza* & M. Mahdavipoura
【文题(必填)】
Rough approximations in a general approximation space and their fundamental properties

【年份(必填)】
2008
【全文链接或数据库名称(选填)】http://www.tandfonline.com/doi/abs/10.1080/03081070701250994