"conspiring" theory

Hi, CCLers
 I wonder if anyone on this list have seen/read any papers about
 "conspiring" theory.
 To my understanding, the theory states that in the transition metal
 complexes, the combination of multiple ligand orbitals can provide better
 interaction with metal than a single ligand orbital does. For example,
 nitrosyl is a good backbonding ligand with metal.  With appropriate
 symmetry, the combination of (pi)* orbital of dinitrosyl can be even
 stronger backbonding ligand because the combinated orbital lows its energy
 from single NO and close to Metal orbitals.
 Best regards!