1. Savich S.V., Boyko Y.I., Khadzhay G.Y., Revyakina M.G., Vovk R.V., Avramchuk O.Y., Gralewski J. Structural relaxation of НоBa2Cu3O7-δ single-crystals with a reduced oxygen content in the process of application and removal of hydrostatic pressure // Journal of V. N. Karazin Kharkiv National University. Series Physics. 2018. № 27. C. 59-67.