One of Auslanders famous theorems is that he proved that the global dimension of a semiprimary ring is equal to the maximum of the projective dimensions of the simple modules of the ring. This result can be found in the book of Auslander, Reiten and Smalo or in the module theory book of Lam. But in both books I found no refence to the original article where Auslander proved it.

What was the original article where Auslander proved this?