@MISC{TREES_9.MIZ,
  AUTHOR = {Bancerek, Grzegorz},
  TITLE = {Subtrees},
  NOTE = {This article has been worked out during the visit of the author
in Nagano in Summer 1994.},
  SECTION1 = {Root Tree and Successors of Node in Decorated Tree},
  SECTION2 = {Set of Subtrees of Decorated Tree},
  SECTION3 = {Set of Subtrees of Set of Decorated Tree},
  DAY = {25},
  MONTH = {November},
  YEAR = {1994},
  ADDRESS1 = {Institute of Mathematics\\Polish Academy of Sciences},
  SUMMARY = {The concepts of root tree, the set of successors of a node in decorated
tree and sets of subtrees are introduced.}}

