Effective collision strengths for allowed transitions among the n 5 degenerate levels of Al XIIIK. M. Aggarwal, A. Igarashi, F. P. Keenan and S. NakazakiA&A, 479 2 (2008) 585-588DOI: https://doi.org/10.1051/0004-6361:20078933
5 degenerate levels of Al XIII 5 degenerate levels of Al XIII