投稿需要写DOI，求帮助！能帮忙查找下下面几篇论文的DOI吗？
1、Zhao Long, Yong wei, Xia Long. A new method of background value optimization in grey prediction model. Journal of Grey system. 2015; 18(1):41-46.
2、Bao Li, Yong Wei. Optimized GM(1,1) grey model based on Romberg algorithm. Journal of Grey System. 2008; 20(2):125-134
3、Yue Shen, Ping Qin. Optimization of grey model with the fractional order accumulation. Journal of Grey System. 2014; 17(3):127-132.
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自己顶一下，其它论文都查到了，就这3篇不好查。哪位虫友帮帮忙，感激不尽！！
Optimized GM (1, 1) based on Romber algorithm and quadratic interpolation method
Bo Li; Sheng-Li Zhao; Ling Fang
2009 International Conference on Apperceiving Computing and Intelligence Analysis
Year: 2009
Pages: 128 - 131, DOI: 10.1109/ICACIA.2009.5361136
IEEE Conference Publications，
其他的我也查不到了，不知道你是怎么查的