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1. Moreira dos Santos A., Amaral V.S., Brandao P., Almeida Paz F.A., Roch J., Ferreira L.P., Godinho M., Volkova O. and Vasiliev A. Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11. Phys. Rev. B 72 (2005), 092403. 2. S.–L. Drechsler, O. Volkova, A.N. Vasiliev, N. Tristan, J. Richter, M. Schmitt, H. Rosner, J. Malek, R. Klingeler, A.A. Zvyagin, and B. Büchner, Frustrated cuprate route from antiferromagnetic to ferromagnetic spin – ½ Heisenberg chains: Li2CuZrO4 as a missing link near the quantum critical point. Phys. Rev. Lett. 98, 077202 (2007). 3. I.A. Presnyakov, V.S. Rusakov, T.V. Gubaidulina, A.V. Sobolev, A.V. Baranov, G. Demazeau, O.S. Volkova, V.M. Cherepanov, E.A. Goodilin, A.V. Knot’ko, M. Isobe, Hyperfine interactions and local enviroment of 57Fe probe atoms in perovskite CaMn7O12, Phys. Rev. B 76, 214407 (2007). 4. A.N. Vasiliev, O.S. Volkova, L.S. Lobanovskii, I.O. Troyanchuk, Z. Hu, L.H. Tjeng, D.I. Khomskii, H.-J. Lin, C.T. Chen, N.Tristan, F. Kretzschmar, R. Klingeler, and B. Büchner, Valence states and metamagnetic phase transition in partially B site disordered perovskite EuMn0.5Co0.5O3. Phys. Rev. B, 77, 104442 (2008). 5. Ya. G. Ponomarev, S.A. Kuzmichev, M.G. Mikheev, M.V. Sudakova, S.N. Tschesnokov, O.S. Volkova A.N. Vasiliev, , T. Hanke, C. Hess, G. Behr, R. Klingeler, B. Buchner, Andreev spectrospoy of LaO1-xFxFeAs, Phys. Rev. B, 79, 224517 (2009). 6. O. Volkova, I. Morozov, V. Shutov, E. Lapsheva, P. Sindzingre, O. Cépas, M. Yehia, V. Kataev, R. Klingeler, B. Büchner, and A. Vasiliev, Realization of the Nersesyan – Tsvelik model in (NO)[Cu(NO3)3], Phys. Rev. B 82, 054413 (2010). 7. Y. C. Arango, E. Vavilova, M. Abdel-Hafiez, O. Janson, A. A. Tsirlin, H. Rosner, S.-L. Drechsler, M. Weil, G. Nénert, R. Klingeler, O. Volkova, A. Vasiliev, V. Kataev, and B. Büchner, Magnetic properties of the low-dimensional spin-1/2 magnet -Cu2As2O7, Phys. Rev. B 84, 134430 (2011) 8. A.N. Vasiliev, O.S. Volkova, E. Hammer, R. Glaum, J.-M. Broto, M. Millot, G. Nénert,Y. T. Liu, J.-Y. Lin, R. Klingeler, M. Abdel-Hafiez, Y. Krupskaya, A.U.B. Wolter, B. Büchner, Weak ferrimagnetism and multiple magnetization reversal in α-Cr3(PO4)2, Phys. Rev. B 85, 014415 (2012). 9. I.A. Presnyakov, V.S. Rusakov, G. Demazeau, A.V. Sobolev, Y.S. Glazkova, T.V. Gubaidulina, A.M. Gapochka, O.S. Volkova, A.N. Vasiliev, Magnetic exchange interactions and supertransferred hyperfine fields at (119)Sn probe atoms in CaCu(3)Mn(4)O(12), Phys. Rev. B 85, 024406 (2012). 10. O. S. Volkova, I. S. Maslova, R. Klingeler, M. Abdel-Hafiez, Y. C. Arango, A. U. B. Wolter, V. Kataev, B. Büchner, and A. N. Vasiliev, Orthogonal spin arrangement as possible ground state of three – dimensional Shastry – Sutherland network in Ba3Cu3In4O12, Phys. Rev. B 85, 104420 (2012). 11. Gnezdilov V., Lemmens P., Pashkevich Yu. G., Wulferding, D., Morozov, I. V., Volkova O. S. and Vasiliev A., Dynamical lattice instability versus spin liquid state in a frustrated spin chain system, Phys. Rev. B 85, 214403 (2012). 12. Luo C. W., Wu I. H., Cheng P. C., Lin J.-Y., Wu K. H., Uen T. M., Juang J. Y., Kobayashi T., Chareev D. A., Volkova O. S., Vasiliev A. N., Dynamics and Phonon Softening in FeSe Superconductors, Phys. Rev. Lett. 108, 257006 (2012). 13. Gippius A. A., Gervits N.E., Tkachev A.V., Maslova I.S., Volkova O.S., Vasiliev A.N., Buttgen N., Kraetschmer W., Moskvin A. S., Low-spin S=1/2 ground state of the Cu trimers in the paper-chain compound Ba3Cu3In4O12, Phys. Rev. B 86, 155114 (2012). 14. A. Vasiliev, O. Volkova, E. Zvereva, M. Isobe, Y. Ueda, S. Yoshii, H. Nojiri, V. Mazurenko, M. Valentyuk, V. Anisimov, I. Solovyev, R. Klingeler, and B. Büchner, Barium vanadium silicate: a t2g counterpart of the Hahn purple compound, Phys. Rev. B 87, 134412 (2013). 15. C. Balz, B. Lake, H. Luetkens, C. Baines, T. Guidi, M. Abdel-Hafiez, A. U. B. Wolter, B. Buchner, I. V. Morozov, E. B. Deeva, O. S. Volkova, and A. N. Vasiliev, Quantum spin chain as a potential realization of the Confederate Flag model, Phys. Rev. B 90, 060409R (2014). 16. Volkova O.S., Mazurenko V.V., Solovyev I.V., Deeva E.B., Morozov I.V., Lin J.-Y., Wen C.K., Chen J.M., Abdel-Hafiez M., Vasiliev A.N., Noncollinear ferrimagnetic ground state in Ni(NO3)2, Phys. Rev. B 90, 134407 (2014). 17. K. V. Zakharov, E. A. Zvereva, P. S. Berdonosov, E. S. Kuznetsova, V. A. Dolgikh, L. Clark, C. Black, P. Lightfoot, W. Kockelmann, Z. V. Pchelkina, S. V. Streltsov, O. S. Volkova, A. N. Vasiliev, Thermodynamic properties, electron spin resonance, and underlying spin model in Cu3Y(SeO3)2O2Cl, Phys. Rev. B 90, 214417 (2014). 18. M. Abdel-Hafiez, Y.-Y. Zhang, Z.-Y. Cao, C.-G. Duan, G. Karapetrov, V. M. Pudalov, V. A. Vlasenko, A. V. Sadakov, D. A. Knyazev, T. A. Romanova, D.A. Chareev, O.S. Volkova, A. N. Vasiliev, and X.-J. Chen, Superconducting properties of sulfur-doped iron selenide, Phys. Rev. B, 91, 165109 (2015). 19. A.N. Vasiliev, O.S. Volkova, E.A. Zvereva, A.V. Koshelev, V.S. Urusov, D.A. Chareev, V.I. Petkov, M.V. Sukhanov, B. Rahaman, and T. Saha-Dasgupta, Valence-bond solid as the quantum ground state in honeycomb layered urusovite CuAl(AsO4)O, Phys. Rev. B, 91, 144406 (2015).