Additional file 4_Agri_List of unretrievable articles

This file belongs to a following manuscript: "What evidence exists relating to ecotechnologies in agriculture for the recovery and reuse of carbon and nutrients in the boreo-temperate regions? A systematic map” The file contains a list of unretrievable articles.本文件隶属于下述学术稿件：《寒温带区域农业中用于碳与养分回收再利用的农业生态技术相关证据有哪些？一项系统图谱（systematic map）》。本文件包含一份无法获取的文献列表。