On the ‘expanded local mode’ approach applied to the methane molecule: isotopic substitutions CH3D ←CH4 and CHD3 ←CH4 / O. N. Ulenikov, E. S. Bekhtereva, A. L. Fomchenko [et.al.] // Molecular physics. 2014. Vol. 112, № 19. P. 2529-2556. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000493156