To query the retrieval number of the paper, you can use the WebofScience database, and the specific steps are as follows:

1. Log in to the Webofscience database. Click Start on the selection page.

2, according to the need, input the key words, author's name, title and other information for retrieval.

3. Find the paper you want to retrieve, click the title of the paper, select Save as HTML at the bottom of the page, and then click Save. The default file name is savedrecs.

4. Open the saved file and find the paper retrieval number UTWOS.