id	domain	url
ssh-3432	doi.org	https://doi.org/10.2307/126692
ssh-3432	doi.org	https://doi.org/10.1017/s0007123400003537
ssh-3432	www.britannica.com	https://www.britannica.com/place/soviet-union
ssh-3432	doi.org	https://doi.org/10.1353/kri.2012.0011