The Polito Surface Wave flat-file Database (PSWD): statistical properties of test results and some inter-method comparisons F. Passeri, C. Comina, S. Foti, L. V. Socco (2021) The Polito Surface Wave flat-file Database (PSWD): statistical properties of test results and some inter-method comparisons, In: BULLETIN OF EARTHQUAKE ENGINEERING, ISSN: 1570-761X