Please see paragraph three of the paper mentioned to answer your questions
concerning controls on colony size etc.
I pass on an unrelated note from Reiner Krell:
A little English boy sufering from a brain tumor hopes to recieve enough "get
well" wishes to make it into the Guiness Book of Records before he dies.
He is: Graig Shergold
36 Sherby Road
Carshalton, Surrey SN8 1LD
UK