First I found this:
http://www.fordham.edu/campus_resources/public_affairs/inside_fordham/february_16_2007/news/professor_sees_swarm_24944.asp (http://www.fordham.edu/campus_resources/public_affairs/inside_fordham/february_16_2007/news/professor_sees_swarm_24944.asp)
Which was nice but the real study was in American Scientist. Which I don't subscribe to. However for $12 I could download the article in pdf format. And the cost for you to read from the Palm Beach County Beekeepers website? Priceless.
http://www.beekeeperspbc.com/files/20064511958_866.pdf (http://www.beekeeperspbc.com/files/20064511958_866.pdf)
Warning it's a big file.
Sincerely,
Brendhna