@MISC{TREES_A.MIZ,
  AUTHOR = {Okhotnikov, Oleg},
  TITLE = {Replacement of Subtrees in a Tree},
  ACKNOWLEDGEMENT = {The author wishes to thank to G. Bancerek for his
 assistance during the preparation of this paper.},
  DAY = {01},
  MONTH = {October},
  YEAR = {1995},
  ADDRESS1 = {Ural University\\Ekaterinburg},
  SUMMARY = { This paper is based on previous works \cite{TREES_1.ABS},
 \cite{TREES_2.ABS} in which the operation replacement of subtree in a tree
 has been defined. We extend this notion for arbitrary non empty antichain.
}}

