- CeNoBS: Paiu R.M., Gol'din, P., Popov, D., Tonay, A., Dede, A., Meshkova, G., Timofte, C.; (2021): Marine birds sightings in the Black Se recorded by CeNoBS Aerial Expedition in 2019., more
- CeNoBS: Paiu R.M., Panigada S., Gol'din, P., Popov, D., Tonay, A., Dede, A., Meshkova, G., Timofte C.; (2021): Marine mammal sightings in the Black Sea recorded by CeNoBS Aerial Expedition in 2019., more
- Zhelev, P., Kot, C. 2010. Green Balkans cetacean strandings on the Bulgarian Black Sea coast. Federation of Nature Conservation NGO’s Green Balkans., more
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