• Ensure involvement of the international organizations and groups of sivil society working on the GBT issues in the process of developing and implementing the special programmes; • Take all necessary measures in order to strengthen the work of the psychologist and a social worker with the prisoners in the maintenance service to increase the acceptance among the prisoners and to prevent the self-isolation and self-harm. It is significant to talk with the inmates specifically on the adverse effects of the informal prison rules, which leads to violence against prisoners, their abuse, stigmatization and exclusion; • Take all necessary measures so that all convicts enjoy the walking yard equally. • Take all necessary measures to involve the prisonsers employed in the maintenance service and the GBT inmates in the rehabilitation programmes. 2.6.6. REPRESENTATIVES OF ETHNIC AND RELIGIOUS MINORITIES, FOREIGN CITIZENS AND STATELESS PERSONS The foreign citizens and representatives of ethnic or religious minorities placed in the penitentiary institution, constitute a particularly vulnerable group. The language barrier is a specific problem with this kind of prisoners due to which the majority of the above inmates knows nothing about their legal rights. According to rule 38.3 of the European Prison Rules, linguistic needs shall be met by using competent interpreters and by providing written material in the range of languages used in a particular prison. At the end of 2015, 368 foreign citizens and stateless accused/convicts were placed in the penitentiary institutions. See below the table demonstrating the monthly number of foreign citizens and stateless persons: Month Accused/Convicts January February March April May June July 265 287 260 271 269 276 276 NATIONAL PREVENTIVE MECHANISM (NPM), 2015 153