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Nikolai Evgen’evich Alekseevskii (on his eightieth birthday)a Kapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation b Kazan State Technological University, ul. Karla Marksa 68, Kazan, 420015, Russian Federation c Dipartimento di Fisica, Università di Trento and BDC Center, Povo, Trento, I-38050, Italy
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