@article{ConstantinescuScharf2010,
  author    = {Florin Constantinescu and G{\"u}nter Scharf},
  title     = {Generalized Gram-Hadamard inequality},
  journal   = {Journal of inequalities and applications},
  volume    = {2},
  number    = {4},
  pages     = {381 -- 386},
  doi       = {doi:10.1155/S1025583498000241},
  year      = {2010},
}