  In this work we demonstrate that what was previously considered as different
mechanisms of baryon asymmetry generation involving two right-handed Majorana
neutrinos with masses far below the GUT scale -- leptogenesis via neutrino
oscillations and resonant leptogenesis -- are actually united. We show that the
observed baryon asymmetry can be generated for all experimentally allowed
values of the right-handed neutrino masses above $M_N \gtrsim 100$ MeV.
Leptogenesis is effective in a broad range of the parameters, including mass
splitting between two right-handed neutrinos as big as $\Delta M_N/M_N \sim
0.1$, as well as mixing angles between the heavy and light neutrinos large
enough to be accessible to planned intensity experiments or future colliders.
