Period Spacings of Most Red Giants Observed by Kepler
Proceedings article published in 2013 by
D. Stello,
D. Huber,
T.~R Bedding,
O. Benomar,
L. Bildsten,
Y. Elsworth,
R.~L Gilliland,
B. Mosser,
B. Paxton,
T.~R White 
