1211.4593 (D. V. Evtushinsky et al.)

Electronic band structure and momentum dependence of the superconducting
gap in (Ca, Na)Fe2As2 from angle-resolved photoemission spectroscopy
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D. V. Evtushinsky, V. B. Zabolotnyy, L. Harnagea, A. N. Yaresko, S. Thirupathaiah, A. A. Kordyuk, J. Maletz, S. Aswartham, S. Wurmehl, E. Rienks, R. Follath, B. Büchner, S. V. Borisenko