比菲尔德学术搜索引擎

超过3.4亿件科学文献来自超过11000免费来源。BASE是世界性大型搜搜引擎，存储来自互联网上免费的开放获取科学文献。BASE is one of the world\'s most voluminous search engines especially for academic web resources. BASE provides more than 340 million documents from more than 11,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.