@misc{55207,
  author       = {{Milkov, Nikolay}},
  isbn         = {{953-127361-1}},
  pages        = {{660}},
  publisher    = {{Sofia: Nauka i Izkustvo}},
  title        = {{{Philosophische Untersuchungen}}},
  year         = {{1988}},
}

@misc{55208,
  author       = {{Milkov, Nikolay}},
  isbn         = {{953-127361-1}},
  pages        = {{660}},
  publisher    = {{Sofia: Nauka i Izkustvo}},
  title        = {{{Bemerkungen über die Grundlagen der Mathematik}}},
  year         = {{1988}},
}

@misc{55206,
  author       = {{Milkov, Nikolay}},
  isbn         = {{953-127361-1}},
  pages        = {{660}},
  publisher    = {{Sofia: Nauka i Izkustvo}},
  title        = {{{Tractatus Logico-Philosophicus}}},
  year         = {{1988}},
}