Mourning has a psychical function to perform From Sigmund Freud?

Question:

Mourning has a psychical function to perform From Sigmund Freud?

Hello, I am looking for the ORIGINAL source for the quote bellow. It is important to know where the quotation was published at the first origin. Thanks
""""Mourning has a psychical function to perform. Its task is to separates the survivors?? hopes and memories from the dead Freud 1913 (Mourning & Melancholy Book wasn??t written until 1917)"""

Best Answer - Chosen by Asker:

I would check for his notes and lectures which is the probable first occurrence.