Trapping of free radicals with direct in vivo EPR detection: a comparison of 5,5-dimethyl-1-pyrroline-N-oxide and 5-diethoxyphosphoryl-5-methyl-1-pyrroline-N-oxide as spin traps for HO and SO4•−Graham S. Timmins, Harold M. Swartz, Ke Jian Liu et al.|Free Radical Biology and Medicine|1999Cited by 298