Papers that treat a relation of dependence between classes of business include Ambagaspi-tiya(1998), Baurble and Muller(1998), Cossette and Marceau(2000), Wu and Yuen(2003), Yuen, Guo and Wu(2002), Albrecher and Boxma (2004) etc.

• uerle和Miller(1998),Cossette和Marceau(2000),Wu和Yuen(2003),Yuen,Guo和Wu(2002),Albrecher和Boxma(2004)等等。