Cheianov et al. and Shytov et al. disagree on the decay type of the interaction on the graphene. Cheianov et al. claims the 1/r 3 decay of the FOs on monolayer graphene due to the strong influence of electron chirality. In contrast, Shytov et al. describe a new 1/r Friedel-resembling interaction between adsorbates via the graphene surface. Gawronski et al. and Silkin et al. have described an interesting case of stronger Friedel oscillations coming from the coupling to the acoustic phonon mode. In terms of describing the FOs straightforwardly from the crystal's Green's function, Villain 114 has shown a good concise explanation that could be useful if the shape of the particular Fermi line is already known. However, in 1960 Maleev 126 described a mathematical procedure, which got him the DKP Green's function for a 1D Dirac-Kronig-Penney crystal model . Yet, the problem is that his procedure only works due to the Shah function (being a sum of equally-spaced Dirac deltas) transforming almost into itself via the Fourier transform. In contrast, we generally do not have such a nice property. Of course, for some physical insights, his procedure may be used. Yet, mostly, it is reduced to just numerical computations.