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Vasileva, Elka and Hristova – Pesheva, Juliya (2019): Green communications through ISO 14 000 standards series and other voluntary initiatives. Published in: Proceedings book of 15th International Conference on ‘Standardization, Protypes, and Quality’, A Means of Balkan Collaboration” , Vol. № 218, No. Trakya University Publication (24 October 2019): pp. 593-600.

Vasileva, Elka and Ivanova, Daniela (2003): Знаците за екопродукти – източници на информация или съмнениe? Published in: Alternativi , Vol. 4, No. 58 (2003): pp. 12-16.

Vasileva, Elka and Ivanova, Daniela and Nikolov, Bogomil (2012): System for comparative testing of products with participation of stakeholders from the disclosure of consumers’ information in Bulgaria (Система за независими сравнителни продуктови изпитвания с участието на заинтересовените страни от представяне на потребителска информация в България). Published in: Economic and social alternatives , Vol. 3, (2012): pp. 41-50.

Vasileva, Elka and Nikolov, Bogomil and Ivanova, Daniela (2013): Независима информация за потребителите чрез сравнителни изпитвания. Published in: (2013)