functors between categories of monads?

Please help! I need information on functors between categories of monads. Any links/references are welcome. Thanx! -- Dipl.-Math. Claus Juergensen Inst. f. Theoretische Informatik, Technische Universitaet Dresden, D-01062 Dresden, Germany phone: +49(0)351/463-38253, http://wwwtcs.inf.tu-dresden.de/~claus/ 27-Apr-2002 18:50:16 -0300,1203;000000000000-00000000