Batch editing references
Mendeley does it actually. I did not try properly before. 

Then I had a problem with getting the authors correct. What you need to do is put them as follows

Last Name, First Names
Last Name, First Names


and so on.

After Edit-1:Another useful thing in Mendeley is that, you just have to select the authors from the pdf and Mendeley will give suggestions on the syntax based on existing authors in the current database. See the following image.