@incollection {MR1842894,
    AUTHOR = {Penot, Jean-Paul and Z{\u{a}}linescu, Constantin},
     TITLE = {Approximation of functions and sets},
 BOOKTITLE = {Approximation, optimization and mathematical economics
              ({P}ointe-\`a-{P}itre, 1999)},
     PAGES = {255--274},
 PUBLISHER = {Physica},
   ADDRESS = {Heidelberg},
      YEAR = {2001},
   MRCLASS = {49N15 (49J53 90C46)},
  MRNUMBER = {MR1842894 (2002g:49061)},
MRREVIEWER = {Juan-Enrique Mart{\'{\i}}nez-Legaz},
}