摘要富化未成功（S2/OpenAlex 都没返回摘要），下次运行会自动重试；也可在本地跑
paperbot doctor 检查来源连通性。
@article{Sperber20,
title = {Review of “Functional and Reactive Domain Modeling” by Debasish Ghosh, Manning, 2017, ISBN 978-1-617-29224-8},
author = {MICHAEL SPERBER},
journal = {Journal of Functional Programming},
volume = {30},
year = {2020},
doi = {10.1017/s0956796820000180}
}