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АДРЕС НА АВТОРА
Инж. Александра Тодорова Минно-геоложки университет „ Св. Иван Рилски " Младост 1, бул. „ Андрей Ляпчев ", 1784 София, Телефон: + 359897943537 Е-mail: aleksis. ivanova98 @ gmail. com
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