On the Magnetic Interactions in Metal-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Be</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Compounds

We report magnetization, M\"ossbauer, and neutron experiments to determine the low-temperature magnetic structure of the heavy-fermion compound ${\mathrm{NpB...