It is very unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (such as China, Japan, Korea and many others worldwide). As this work was first published before 1926 or failed to meet notice or renewal requirements to secure statutory copyright with no "restoration" under the GATT amendments, it is very likely to be public domain in the USA as well.
|First Publication||1911 – Moscow: P. Jurgenson|
|Genre Categories||; ;; ; ;|
|Work Title||String Quartet|
|Opus/Catalogue NumberOp./Cat. No.||Op.13|
|I-Catalogue NumberI-Cat. No.||IAB 1|
|First Publication.||1911 – Moscow: P. Jurgenson|
|Composer Time PeriodComp. Period||Early 20th century|
|Instrumentation||2 violins, viola, cello|
He also composed a 2nd quartet but its SBN entry gives "Milano : G. Ricordi e C. Edit. Tip., 1931" - it might be PD-CA in 2021 or so, anyway.