@article{10_1090_S0894_0347_06_00521_2,
     author = {Rezk, Charles},
     title = {The units of a ring spectrum and a logarithmic cohomology operation},
     journal = {Journal of the American Mathematical Society},
     pages = {969--1014},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {2006},
     doi = {10.1090/S0894-0347-06-00521-2},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-06-00521-2/}
}