p-refinement
increase the order of interpolation polynomials
Gavrilovic et al., IEEE Trans. Magn., 33 (1997) 4128.
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r-refinement
reduce element size by moving nodes
number of unknowns remains constant
Hertel et al., IEEE Trans. Magn. 34 (1998) 3922.
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h-refinement
additional degrees of freedom by inserting nodes and elements
Hertel et al., IEEE Trans. Magn. 34 (1998) 3922.
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h-refinement
additional degrees of freedom by inserting nodes and elements
Bagnérés-Viallix et al., IEEE Trans. Magn., 27 (1991) 3819
Tako et al., J. Appl. Phys. 81 (1997) 4082
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