Also, from what I can tell (and I am by no means an expert in this field, so I could be wrong) not everybody makes a hard distinction between "Brain Computer Interface" and "Computer Brain Interface", so be careful of overly limiting your searching. For example, Nicolelis seems to prefer the term "Brain Machine Interface" and, from what I remember of Beyond Boundaries, treats them as (potentially) full-duplex channels.
Or, for his more academic work, see: http://www.nicolelislab.net/
You might also get some mileage out of searching Google Scholar for some relevant terms.
http://scholar.google.com/scholar?q="computer+brain+interfac...
Also, from what I can tell (and I am by no means an expert in this field, so I could be wrong) not everybody makes a hard distinction between "Brain Computer Interface" and "Computer Brain Interface", so be careful of overly limiting your searching. For example, Nicolelis seems to prefer the term "Brain Machine Interface" and, from what I remember of Beyond Boundaries, treats them as (potentially) full-duplex channels.
[1]: http://www.beyondboundariesnicolelis.net/~beyond/wordpress/
[2]: http://www.amazon.com/Beyond-Boundaries-Neuroscience-Connect...