Hi, do you have a reference paper for your protocol?

Since this is a well developed and relatively common protocol, there is no reference for this protocol.

But if you would like explore more literature to help your experiment, you could check the manuals of related products from commercial vendor, such as Qiagen, Pierce, GE etc, which I often found helpful.

Here are some examples:

https://www.gelifesciences.com/gehcls_images/GELS/Related%20Content/Files/1314787424814/litdoc28962284AA_20110831144559.pdf

http://www.piercenet.com/instructions/2160671.pdf

Hope this helps.