@MISC{JORDAN13.MIZ,
  AUTHOR = {Trybulec, Andrzej},
  TITLE = {Introducing Spans},
  NOTE = {This work has been partially supported by CALCULEMUS
 grant HPRN-CT-2000-00102.},
  DAY = {27},
  MONTH = {May},
  YEAR = {2002},
  ADDRESS1 = {University of Bia{\l}ystok},
  SUMMARY = {A sequence of internal approximations of simple closed
   curves is introduced. They are called spans.}}

