Journal article (2007) - Simon Groblacher (author), Simon Gröeblacher (author), S. Gröblacher (author), Simon Groeblacher (author), S. Groeblacher (author), S. Groblacher (author), Simon Gröblacher (author), S. Gröeblacher (author), T. Paterek (author), R. Kaltenbaek (author), Č Brukner (author), M. Zukowski (author), M Aspelmeyer (author), A Zeilinger (author)