Reading *General Principles of Quantum Mechanics* by Pauli, I came across the Pauli argument about the impossibility of existence of time operator in classical quantum mechanics. In p. 63 he mentions a Schrödinger article about this argument: E. Schrödinger, Berl. Ber. (1931) p. 238), that I think it’s  Spezielle Relativitätstheorie und Quantenmechanik
Sitzungsberichte der Preußischen Akademie der Wissenschaften. Physikalisch-mathematische Klasse, (1931), 238-247. I searched for it in the internet and I wasn’t able to find it. Could someone indicate me where I can find it if there is in anyplace online?

However from https://arxiv.org/abs/quant-ph/9908033 I found an explicit demonstration of the argument, but I have a doubt. The argument is based on the assumption that the parameter $\beta \propto R$. If it’s so then the eigenvalues of $H$ will be continuous and unlimitated. But what if I restrict the domain of $\beta$ to a discrete subset of $R$ such that the eigenvalues of $H$ would be inferiorly limited and eventually discrete in relation to the specific Hamiltonian? In this way I would bypass the Pauli argument and could have a time operator self adjoint with a unitary energy translation operator! Could someone correct me?