[ccp4bb] B-factor standardization

[Oliviero Carugo]

Dears,

everybody knows that B-factors may change amongst different crystal 
structures and that they need to be standardized when different protein 
crystal structures are compared.

If I am not wrong, I remember that someone proposed to standardize 
B-factors of protein atoms as “BS = B - Bave”, where Bave is the average 
B-factor of the protein. Such standardization is based on the hypothesis 
that independent sources of disorder add in determining the final 
B-factor. BS should represent atomic B-factors depurated by all factors 
different from atom oscillation, since Bave differences are neutralized.

Does anyone can help me in finding a publication (80s or 90s) where 
these BS values are used?

Thanks!

Oliviero