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Kühl, Toni, Georgieva, Maya G., Hübner, Harald, Lazarova, Maria, Vogel, Matthias, Haas, Bodo, Peeva, Martina I., Balacheva, Aneliya A., Bogdanov, Ivan P., Milella, Luigi, Ponticelli, Maria, Garev, Tsvetomir, Faraone, Immacolata, Detcheva, Roumyana, Minchev, Borislav, Petkova-Kirova, Polina, Tancheva, Lyubka, Kalfin, Reni, Atanasov, Atanas G., Antonov, Liudmil, Pajpanova, Tamara I., Kirilov, Kiril, Gastreich, Marcus, Gmeiner, Peter, Imhof, Diana, and Tzvetkov, Nikolay T.

Tzvetkov, Nikolay T., Stammler, Hans-Georg, Georgieva, Maya G., Russo, Daniela, Faraone, Immacolata, Balacheva, Aneliya A., Hristova, Silvia, Atanasov, Atanas G., Milella, Luigi, Antonov, Liudmil, and Gastreich, Marcus

Tzvetkov, Nikolay T., Stammler, Hans-Georg, Hristova, Silvia, Atanasov, Atanas G., and Antonov, Liudmil

Khan, Haroon, Nabavi, Seyed Mohammad, Sureda, Antoni, Mehterov, Nikolay, Gulei, Diana, Berindan-Neagoe, Ioana, Taniguchi, Hiroaki, and Atanasov, Atanas G.

Khan, Haroon, Rengasamy, Kannan R.R., Pervaiz, Aini, Nabavi, Seyed Mohammad, Atanasov, Atanas G., and Kamal, Mohammad A.