_:n8c52593246614be39d2ed096aa53e683xb1
<http://schema.org/isAccessibleForFree>
<https://link.springer.com/article/10.1007/s10470-006-9007-7?error=cookies_not_supported&code=cec580f4-852f-4c6e-90ac-0690b4c8ab1f>