using the latest dev version of FeynCalc I can not reproduce some of my
earlier results. I also noticed that A0[m^2] reduces to
m^2*B0[0, m^2, m^2]
while the latest stable release yields
m^2 + m^2*B0[0, m^2, m^2].
Now I am not 100% certain that this is an error or a question of definition.
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