If you are wanting information on a very specific aspect of Dracula then we suggest you join the State Library of Victoria (SLV) and look at their JSTOR database. There are literally hundreds of academic articles that you may download for free. You do need to be a member of the SLV to access that wonderful database (see join up link below).
Once you are a member go the the "Search and Discover" section of the SLV's site and click on the JSTOR icon!
Good short video - goes for a bit over 7 minutes
Bram Stoker