The Mechanism of the Oxynitration of Benzene F. H. Westheimer, Edward Segel, and Richard Schramm J. Am. Chem. Soc.; 1947; 69(4) pp 773 - 785; doi:10.1021/ja01196a011
The Oxynitration of Benzene. I. Studies Relating to the Reaction MechanismsMarvin Carmack, Manuel M. Baizer, G. Richard Handrick, L. W. Kissinger, and Edward H. Specht J. Am. Chem. Soc.; 1947; 69(4) pp 785 - 790; doi:10.1021/ja01196a012