D.M. Brink, Y.M. Engel, K. Goeke, S.J. Krieger, D. Vautherin. Isoscalar monopole vibrations in $^{16}$O and $^{40}$Ca with Skyrme's interactions.
Spring Meeting of the Fachausschuss Kernphysik und Hochenergiephysik of the Dpg, Apr 1975, The Hague, Netherlands. pp.757-758.
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