Oldest Open Clusters

Dear Group,

I have located a paper from Astronomy & Astrophysics which identified
some of the oldest open clusters in our galaxy. I was wondering if
someone knows of a source which is after 2004 and which would be more
recent (not that I am complaining that 2004 is outdated but just in case
there is something more recent which I could not locate).

For anyone interested as to the 2004 source, enjoy:
http://www.mpa-garching.mpg.de/~weiss/aa_414_163.pdf ..... having
already imaged M67 and NGC 188, I would like to pursue these older
clusters further with a web page dedicated to them and which is already
under construction.

Thanks in advance!

Anthony.