labelling cases

[Raphael Clifford]

Hi,

I have an equation with three cases.. something like

d_i,j = a if blah1
      = b if blah2
      = c if blah3
I am using the cases enviroment to do this? How can I label these cases 
so I can say later something like "Case (1) shows..."?

Cheers,
Raphael