This article mainly uses literature reference and material method, expert questionnaire method, questionnaire survey method, data statistics method to carry on the investigation and the research.

本文主要采用了文献资料法、专家访谈法、问卷调查法、数据统计等方法来进行调查与研究。

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No reference to their existence appears in any literature of the period.

该时期的任何文献中都没有提及他们的存在。

《柯林斯英汉双解大词典》

Then, by making direct reference to your literature review, you must demonstrate that your question (a) has not been previously answered, and (b) is worth answering.

然后，对你的文献回顾做出清晰的参考书目，你必须表明你的问题(a)以前没有被回答过，(b)它的知道回答的。

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Ian Hacking, who wrote a history of probability theory, searched through world literature for any reference to a probability and could find none anywhere before 1600.

伊恩·哈金为概率论追根溯源,他查遍世界所有关于概率的文献,发现无法追溯到十七世纪以前

耶鲁公开课 - 金融市场课程节选

Witnesses to History is literature appropriate for students and the general public, and a reference book for specialists, scholars and decision-makers.

UNESCO: Culture