If you submitted paper to an editor and find a referee may violate the professional ethics, say, a report full of mistakes and bias, having you wait for years for his/her report, etc, where should you complain?

The spaces $\mathcal{L}^2(\mathbb{R})$ (square-integrable functions) and $\mathcal{L}^2(\mathbb{T})$ (1-periodic square-integrable functions) are two subspaces of the space of tempered distributions $\mathcal{S}'(\mathbb{R})$ and one can easily show that the sum $\mathcal{L}^2(\mathbb{R}) \oplus ...