Ultrahigh-energy cosmic-ray spectrumChristopher T. Hill, David N. Schramm|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|1985Cited by 239
Grand unified theories, topological defects, and ultrahigh-energy cosmic raysPijushpani Bhattacharjee, David N. Schramm, Christopher T. Hill|Physical Review Letters|1992Cited by 233
Ultra-high-energy cosmic rays from superconducting cosmic stringsChristopher T. Hill, Terry P. Walker, David N. Schramm|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|1987Cited by 175