Gruppelaar, H. (1969). Investigation of thermal-neutron capture reactions in some even calcium isotopes. Avanti.
Lua i Stíl Chicago (17ú heag.)Gruppelaar, Harm. Investigation of Thermal-neutron Capture Reactions in Some Even Calcium Isotopes. Zaltbommel: Avanti, 1969.
Lua MLA (8ú heag.)Gruppelaar, Harm. Investigation of Thermal-neutron Capture Reactions in Some Even Calcium Isotopes. Avanti, 1969.
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