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Köble, Ulrich and Kiernan, Laurence and Costello, John T. and Mosnier, Jean-Paul and Kennedy, Eugene T. and Ivanov, V. and Kupchenko, V. and Shendrik, M. (1995) 4 f(P1) giant dipole resonance in La³⁺. Physical Review Letters, 74 (12). pp. 2188-2191. ISSN 0031-9007
Köble, Ulrich (1994) A photoabsorbtion study of La3+ and Au in the giant resonance energy region. PhD thesis, Dublin City University.