ON THE ORIGIN OF A KINK IN THE HARDNESS SPECTRA OF COSMIC-RAY PROTONS AND HELIUM NUCLEI IN THE VICINITY OF 230 GV СтатьяLoznikov V.M., Erokhin N.S., Zol’Nikova N.N., Mikhailovskaya L.A.Plasma Physics Reports. Том v 41. 2015. С. 637-644