Robert R. Squires (1997), Generation of α-acetolactone and the acetoxyl diradical •CH2COO• in the gas phase. International Journal of Mass Spectrometry
7]dodec-3-ene to trans- and cis,endo-tricyclo[6.2.2.02,7]dodec-9-ene: diradical conformations and stereochemical outcomes in [1,3] carbon shifts. Tetrahedron
76. Concerted nature of 1,3-dipolar cycloadditions and the question of diradical intermediates. The Journal of Organic Chemistry. 1976, 41 (3): 403. doi:10