Participants: Eugenia Kovatcheva, Boyan Jekov, Willian Dimitrov, Veselin Tselkov, Vladimir Yotsov, Georgi P Dimitrov, Elena Shoikova, Ivan Ivanov, Ivanka Pavlova, Irena Peteva, Krasimira Ivanova, PhD Student Natalia Palikova, Roumen Nikolov, Stoyan Denchev, Taisiya Vladimirova, Tsvetlin Yovchev, Bella Tetevenska, Georgi G. Dimitrov, Nikolay Stoyanov

Participants: Eugenia Kovatcheva, Elena Shoikova, Willian Dimitrov, Boyan Jekov, PhD Student Oleg Konstantinov, PhD Student Natalia Palikova, Roumen Nikolov, Georgi P Dimitrov, Galina Panayotova, Rumyana Mancheva, Stoyan Denchev, Ivanka Pavlova, Irena Peteva, Krasimira Ivanova, Taisiya Vladimirova, PhD Student Milena Koleva, Student Nikola Tomov

Participants: Eugenia Kovatcheva, Roumen Nikolov, Stoyan Denchev, Irena Peteva, Ivanka Pavlova, PhD Student Natalia Palikova, PhD Student Oleg Konstantinov, Krasimira Ivanova, PhD Student Ilia Vukarski, Taisiya Vladimirova, Katerina Mahmoudieva