1. Marschner H., Mineral Nutrition of Higher Plants, London: Academic Press, 1995.
2. Lyubenova M, Mirchev St, Dynamics of Zn, Mn and Fe Content in Fagus sylvatica L. Phytomass from two Beech Communities in the Western Balkan Mountains, Journal of Balkan ecology, Vol. 1, No.4, 1998, pp. 71-77.
3. Lyubenovа M, Dimitrova V., Chemical Elements in Mulch and Litter-fall of Beech Ecosystems and their Total Turnover, Ecologia Balkanica, Vol l, No.3(1), 2011, pp. 51-57.
4. Dimitrova V., Damyanova S. Litterfall in common beech (Fagus sylvatica L.) forest communities – a depot of important chemical elements. Scientific studies of the Union of Scientists, Plovdiv. Series B: Natural Sciences and Humanities, ISSN: 1311-9192, eISSN: 2534-9376, Vol.18, 2018, pp. 59-63.
5. Seibold S., Rammer W., Hothorn T., Seidl R., Ulyshen M.D., Lorz J., Cadotte M.W., Lindenmayer D.B., Adhikari Y.P., Aragón R., et al., The Contribution of Insects to Global Forest Deadwood Decomposition, Nature, Vol. 597, 2021, pp. 77–81.