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Acknowledgements:
Special thanks to Prof. E. Bozilova, Doz. S. Топкоv, Prof. M. Anchev, Prof. G. M,
Dlusskii. Prof. A. Dafni, Prof. A. J. Richards, and Prof. B. Amman for the interest to this work, the useful
continents and the
support.
Cordial thanks to Dr. M. Berezin for the help with identification of the bumblebee
species.
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