In the main project, certain projects don't reference each other for obvious reasons. For example, Accord.Math cannot reference Accord.MachineLearning, but actually it is Accord.MachineLearning that should reference Accord.Math.

However, the same cannot be said for the unit tests. In the current version, the unit tests have references among themselves, which might be a bit confusing, specially if you are trying to disentangle them from the main project.

As such, uncommon dependencies must be removed, and the resulting broken tests and references should be fixed.