@article {
   BKS12,
   author = {Benjamin Bustos and Sebastian Kreft and Tomas Skopalš},
   title = {Adapting metric indexes for searching in multi-metric spaces},
   journal = {Multimedia Tools and Applications},
   publisher = {Springer Netherlands},
   issn = {1380-7501},
   keyword = {Computer Science},
   pages = {467-496},
   volume = {58},
   issue = {3},
   url = {http://dx.doi.org/10.1007/s11042-011-0731-3},
   note = {10.1007/s11042-011-0731-3},
   year = {2012}
}