Recently I read a paper about Ricci solitons. I quote a paragraph of it here:
In dimension three, the classification of complete gradient steady Ricci solitons is still open. Known examples are given by quotients of $\Bbb R^3$, $\Sigma^2×\Bbb R$ and the rotationally symmetric one constructed by Bryant. In the paper by Brendle, it was shown that the Bryant soliton is the only nonflat, $k$-noncollapsed, steady soliton, proving a famous conjecture by Perelman.
Apart from known example of Prof. Bryant, the authors of the above paper have not provided any references for bolded examples. Does anyone know where can I find this examples?
