1. Abramenko, V.L., Fisk, L.A., and Yurchyshyn, V.B. 2006, The rate of emergence of magnetic dipoles in coronal holes and adjacent Quiet-Sun regions, ApJ 641, L65, [21 c, 2 c/y].
2. Cranmer, S.R. 2009, Coronal holes, LRSP 6, 3, [126 c, 15 c/y].
3. Fisk, L.A. and Zurbuchen, T.H. 2006, Distribution and properties of open magnetic flux outside of coronal holes, JGR 111/A9, CiteID A09115, [34 c, 3 c/y].
4. Hagenaar, H.J., DeRosa, M.L., and Schrijver, C.J. 2008, The dependence of ephemeral region emergence on local flux imbalance, ApJ 678, 541, [39 c, 4 c/y].
5. Krista, L.D. and Gallagher, P.T. 2009, Automated coronal hole detection using local intensity thresholding techniques, SoPh 256, 87, [48 c, 6 c/y].