@article{Ginzburg:1961,author = {V. L. Ginzburg and S. I. Syrovatskii},title = {Present status of the question of the origin of cosmic rays},publisher = {Physics-Uspekhi},year = {1961},journal = {Phys. Usp.},volume = {3},number = {4},pages = {504-541},url = {https://ufn.ru/en/articles/1961/4/b/},doi = {10.1070/PU1961v003n04ABEH003303}}