Let us consider a linear time-invariant system. The term minimum phase is used for a system that has stable poles and stable zeros. A system is called nonminimal phase if it is not minimum phase.
The problem that I have is that these definitions do not make it clear if a system with one pole or one zero which has a real part of zero is still called minimal phase or not.
Is there some reference that is giving a clear definition of the term minimal phase?