In 2018  
  Part of: Kachamakova M, Koshev Y, Rammou D-L, Spasov S (2022) Rise and fall: Results of a multidisciplinary study and 5-year long monitoring of conservation translocation of the European ground squirrel. Biodiversity Data Journal 10: e83321. https://doi.org/10.3897/BDJ.10.e83321