The author does not give references.
作者没有注明参考文献的出处。
I cannot here give references and authorities for my several statements.
我不能在这里对我的许多论述指明其出处和参考资料。
The answers to some of these problems can now be found in the literature, but I have made no attempt to give references.
一部分习题的答案现在可以从文献中找到,但我没有试图给出参考书目。
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