Non-self-adjoint harmonic oscillator, compact semigroups and pseudospectra LS Boulton Journal of Operator Theory, 413-429, 2002 | 64 | 2002 |

Basis properties of eigenfunctions of the 𝑝-Laplacian P Binding, L Boulton, J Čepička, P Drábek, P Girg Proceedings of the American Mathematical Society 134 (12), 3487-3494, 2006 | 56 | 2006 |

Discreteness of the spectrum of the compactified D= 11 supermembrane with nontrivial winding L Boulton, MPG Del Moral, A Restuccia Nuclear Physics B 671, 343-358, 2003 | 48 | 2003 |

On approximation of the eigenvalues of perturbed periodic Schrödinger operators L Boulton, M Levitin Journal of Physics A: Mathematical and Theoretical 40 (31), 9319, 2007 | 47 | 2007 |

On pseudospectra of matrix polynomials and their boundaries L Boulton, P Lancaster, P Psarrakos Mathematics of computation 77 (261), 313-334, 2008 | 35 | 2008 |

On the spectrum of a matrix model for the D= 11 supermembrane compactified on a torus with non-trivial winding L Boulton, MPG del Moral, I Martin, A Restuccia Classical and Quantum Gravity 19 (11), 2951, 2002 | 33 | 2002 |

Non-variational approximation of discrete eigenvalues of self-adjoint operators L Boulton IMA journal of numerical analysis 27 (1), 102-121, 2007 | 30 | 2007 |

Non-variational computation of the eigenstates of Dirac operators with radially symmetric potentials L Boulton, N Boussaid LMS Journal of Computation and Mathematics 13, 10-32, 2010 | 28 | 2010 |

Limiting set of second order spectra L Boulton Mathematics of computation 75 (255), 1367-1382, 2006 | 25 | 2006 |

The heat kernel of the compactified D= 11 supermembrane with non-trivial winding L Boulton, A Restuccia Nuclear Physics B 724 (1-2), 380-396, 2005 | 23 | 2005 |

Approximation properties of the *q*-sine basesL Boulton, G Lord Proceedings of the Royal Society A: Mathematical, Physical and Engineering …, 2011 | 20 | 2011 |

Generalised Weyl theorems and spectral pollution in the Galerkin method L Boulton, N Boussaid, M Lewin arXiv preprint arXiv:1011.3634, 2010 | 19 | 2010 |

Eigenvalue enclosures and convergence for the linearized MHD operator L Boulton, M Strauss BIT Numerical Mathematics 52 (4), 801-825, 2012 | 17 | 2012 |

On the convergence of second-order spectra and multiplicity L Boulton, M Strauss Proceedings of the Royal Society A: Mathematical, Physical and Engineering …, 2011 | 17 | 2011 |

Spectral properties in supersymmetric matrix models L Boulton, MPG del Moral, A Restuccia Nuclear Physics B 856 (3), 716-747, 2012 | 15 | 2012 |

The supermembrane with central charges:(2+ 1) D NCSYM, confinement and phase transition L Boulton, MPG Del Moral, A Restuccia Nuclear physics B 795 (1-2), 27-51, 2008 | 14 | 2008 |

Finite element eigenvalue enclosures for the Maxwell operator GR Barrenechea, L Boulton, N Boussaid SIAM Journal on Scientific Computing 36 (6), A2887-A2906, 2014 | 12 | 2014 |

Projection methods for discrete Schrödinger operators L Boulton Proceedings of the London Mathematical Society 88 (2), 526-544, 2004 | 10 | 2004 |

On the convergence of the quadratic method L Boulton, A Hobiny IMA Journal of Numerical Analysis 36 (3), 1310-1333, 2016 | 9 | 2016 |

A PT-symmetric periodic problem with boundary and interior singularities L Boulton, M Levitin, M Marletta arXiv preprint arXiv:0801.0172, 2008 | 9 | 2008 |