Here's one. It's an Internet encyclopedia, but I've seen the same conclusions in many other places on the Internet.

http://www.daviddarling.info/encyclo...rowndwarf.html

A brown dwarf masses between 13 Jupiter masses and 84 Jupiter masses.

Here's a few links on a few brown dwarfs that fit within that mass range.

Kelu 1 is no more than 75 Jupiter masses

http://www.eso.org/public/outreach/p.../pr-07-97.html

Gliese 229 b is between 25 and 65 Jupiter masses

http://www.solstation.com/stars/gl229.htm

And here's a link on an abstract suggesting that the deuterium burning limit may be used to distinguish brown dwarfs from stars.

http://gpd.jhuapl.edu/abstracts/abst...d_abstract.pdf