графен graphene 7 - 5 Kantorovich variational method 1 ab initio pseudopotential 1 adsorbates 1 analytical regularization procedure 1 critical distance 1 dispersion of elementary excitations 1 eigenfrequencies 1 electron density functional 1 electron density functional method 1 factor systems 1 ferrite layer 1 germanium 1 grapheme 1 graphite 1 heterocomposites 1 mechanisms of hysteresis 1 methanol 1 nanocellulose 1 natural oscillations 1 nonlinear Schr¨odinger equation 1 pseudopotential method 1 scanning tunneling microscopy 1 spinor representations of symmetry groups 1 stripe grating 1 supercritical instability 1 surface dipoles 1 water 1