. "Aharonov-Bohm"@en . . "Thomas" . "Nodal set"@en . "Aharonov-Bohm Hamiltonian"@en . "Nodal domains"@en . "Finite method for problems with mixed boundary conditions"@en . . . "Minimal partition"@en . . "Spectral minimal partitions"@en . "Isospectrality"@en . "48e1a6ceede1a4671ae7de765c5086d0" . . "Thomas Hoffmann-Ostenhof" . "Spectral theory"@en . "Hoffmann-Ostenhof" . "Pleijel's theorem"@en .