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Georgieva, Maya G., Mihaylova, Silvia G., Balacheva, Aneliya A., Tsvetkova, Antoaneta Z., Pajpanova, Tamara I., and Tzvetkov, Nikolay T.

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.

Kolev, Tsonko, Pajpanova, Tamara, Dzimbova, Tatyana, Zareva, Sonya, and Spiteller, Michael

Kučerová, Gabriela, Vozka, Jiří, Kalíková, Květa, Geryk, Radim, Plecitá, Denisa, Pajpanova, Tamara, and Tesařová, Eva

Piccinini, Anna-Maria, Schmid, Martin G., Pajpanova, Tamara, Pancheva, Svetlana, Grueva, Ekatarina, and Gübitz, Gerald

Halacheva, Krassimira, Zhelev, Zhivko, Pajpanova, Tamara, Hubenova, Aneta, Spassova, Maria, Alexiev, Chavdar, and Golovinsky, Evgeny