There are four models of electronic document delivery systems: automatic model, human assisted model, network access model and network subscription model. 8 refs.
实现电子文献传递系统的方式有：自动方式、人工辅助方式、网络访问方式和网络订购方式。参考文献8。
There are four models of electronic document delivery systems: automatic model, human assisted model, network access model and network subscription model. 8 refs.
实现电子文献传递系统的方式有：自动方式、人工辅助方式、网络访问方式和网络订购方式。参考文献8。
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