Tham khảo Phòng_thủ_Hippopotamus

  1. ↑ Fred Reinfeld, The Complete Chess Course, Doubleday & Company, 1953, p. 323.
  2. ↑ Reuben Fine, Ideas Behind the Chess Openings, David McKay, 1943, p. 228.
  3. ↑ Jeremy Gaige, Chess Personalia: A Biobibliography, McFarland & Company, 1987, p. 350. ISBN 0-7864-2353-6.
  4. ↑ Petrosian-Spassky, World Championship, 1966, Game 12. ChessGames.com. Truy cập 2009-05-05.
  5. ↑ Petrosian-Spassky, World Championship, 1966, Game 16. ChessGames.com. Truy cập 2009-05-05.
  6. ↑ Maximilian Ujtelky Playing the Robatsch. ChessGames.com. Truy cập 2009-0505.
  7. ↑ Nezhmetdinov-Ujtelky, Chigorin Memorial, Sochi 1964. ChessGames.com. Truy cập 2009-05-05.
  8. ↑ Amatzia Avni, Devious Chess: How to Bend the Rules and Win, Batsford, 2006, p. 109. ISBN 978-0-7134-9004-6.
  9. ↑ Andrew Martin, The Hippopotamus Rises: The Re-emergence of a Chess Opening, Batsford, 2006, p. 9. ISBN 978-0-7134-8989-7.
  10. ↑ Spassky vs. Ujtelky, Sochi 1964. ChessGames.com. Truy cập 2009-05-05.
  11. ↑ Petrosian vs. Spassky, World Championship 1966, Game 12. ChessGames.com. Truy cập 2009-05-05.
  12. ↑ Petrosian vs. Spassky, World Championship 1966, Game 16. ChessGames.com. Truy cập 2009-05-05.

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