J Robert Oppenheimer. 

"On the Quantum Theory of the Capture of Electrons."  In:  The Physical Review,  volume 21, number 3, March, 1928.  Article occupies pp 349-356 of the monthly issue (which runs pp 317-490.  Offered in the original monthly issue, in the original green wrappers.  Very good copy, though the spine has  a few scuffs here and there, with only a scant bit missing at the very edge top and bottom.  Acceptable copy of a relatively early wrappered issue of the great journal.   $200

This article has been cited more than 300 times, according ot the American Physical Society's PROLA website, here.