其中，example.bib文件的内容如下：

@article{ref1, author = {作者1}, title = {标题1}, journal = {期刊1}, year = {年份1}, volume = {卷号1}, number = {期号1}, pages = {页码1}, }

@book{ref2, author = {作者2}, title = {标题2}, publisher = {出版社2}, year = {年份2}, }