@article{DBLP:journals/ipl/DelgrandeG02,
  author    = {James P. Delgrande and
               Arvind Gupta},
  title     = {Updating $<$=, $<$-chains},
  journal   = {Inf. Process. Lett.},
  volume    = {82},
  number    = {5},
  year      = {2002},
  pages     = {261-268},
  ee        = {http://dx.doi.org/10.1016/S0020-0190(01)00278-2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}