[SI-LIST] Can a thin PCB trace be used as a reliable fuse

Hi Masters,

This is really not an SI related query, but comes under electronics design. 
My query is this. Can a thin PCB trace be used as a reliable fuse. I have a
real estate problem on my PCB & require 4 fuses with current threshold of
6A. I searched for the components & found they too huge to use on the PCB.
So thought I can use trace as fuse!! 
If it is possible is there any paper that has this explained? 

Please help.

Thanks,

Tilak
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