http://www.independent.co.uk/news/world/europe/special-report-the-tortured-activist-whose-fate-tells-turkish-protesters-dont-seek-refuge-in-greece-8650289.html

also:
1) Group of Lawyers for the Rights of Migrants and Refugees' Urgent Announcement
Download the announcement in English here
Download the announcement in French here
Download the announcement in Italian here

2) UNHCR Greece
UNHCR concerned about missing asylum seeker
http://www.ekathimerini.com/4dcgi/_w_articles_wsite1_1_05/06/2013_502820
original text in greek: http://www.unhcr.gr/nea/artikel/b2621b1c159e02fab00983f24cb09264/to-grafeio-tis-ya.html

3) texts translated in italian
http://atenecalling.org/preoccupazione-dellunhcr-per-le-denunce-che-riguardano-il-ritorno-forzato-dalla-grecia-in-turchia-di-un-cittadino-turco/
http://atenecalling.org/sequestro-in-stile-cia-e-consegna-alla-turchia-di-un-militante-della-sinistra/
http://atenecalling.org/sequestro-di-bulut-yiala-membro-della-commissione-di-solidarieta-con-i-detenuti-politici/