Oscillator strength of the strongly "forbidden" Pb 6p2 3P0 → 6p2 3P1 transition at 1278.9 nmC. Vadla, V. Horvatic and K. NiemaxEur. Phys. J. D, 14 1 (2001) 23-25DOI: https://doi.org/10.1007/s100530170229