1. Amadei B (1983) Rock anisotropy and the theory of stress measurement. Springer, Berlin, p 478
2. Andreychuk VN, Benderev AD (1991) Regional peculiarities of the anthropogenic impact on the karst of mountain countries. Informational materials, Ural Branch of Academy of Sciences of USSR, Kongur, p 133 (in Rissian)
3. Angelier J (1994) Fault slip analysis and paleostress reconstruction. In: Hancock PL (ed) Continental deformation. University of Bristol, Pergamon Press, Oxford, pp 53–100
4. Angelier J, Mechler P (1977) Sur une méthode graphique de recherche des contraintes principales également utilisable en tectonique et en séismologie: la méthode des dièdres droits. Bull Soc Geol Fr 7:1309–1318
5. Angelova D, Benderev A, Baltakov G, Ilieva I, Nenov T (1995) On the evolution of the karst in Stara Planina Gorge. J Bulg Geol Soc 3:111–124 (in Bulgarian)