Derivative sources in lattice spectroscopy of excited light-quark mesons
  We construct efficient interpolating fields for lattice spectroscopy of mesons by applying covariant derivatives on Jacobi smeared quark sources. These interpolators are tested in a quenched calculation of excited mesons based on the variational method. We present results for pseudoscalar, scalar, vector and pseudovector mesons. 
Christof Gattringer, Leonid Ya. Glozman, C. B. Lang, Daniel Mohler,   Sasa Prelovsek