[R] IEEE standard for rounding?

[Don MacQueen]

?round states "Note that for rounding off a 5, the IEEE standard is used..."

I would like to properly reference the standard. I am searching a 
IEEE website and finding it difficult discover which IEEE standard 
this is.

Could someone tell me the IEEE standard number?

Thanks
-Don
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Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA