The pragmatic classification of depression. Blinder MG. Am J Psychiatry. 1966 Sep;123(3):259-69. doi: 10.1176/ajp.123.3.259. PMID: 5917611
[Diagnosis of depressive equivalents]. Sáiz Ruiz J, Ibáñez Cuadrado A. Rev Clin Esp. 2002 Feb;202(2):88-90. doi: 10.1016/s0014-2565(02)70991-0. PMID: 11996761
On the phenomenology of the depressive illnesses. Lehmann HE. Can Psychiatr Assoc J. 1966;11:Suppl:3-6. doi: 10.1177/070674376601101s07. PMID: 5937838