Why can't HowNet find the doctoral thesis of Lanzhou University in recent five years?

Lanzhou University doctoral thesis knowledge network can't be found in recent five years because:

1. HowNet will sign a thesis with the doctoral students of the school to publish the graduation license before the doctoral thesis is included. Doctoral thesis involves confidentiality agreement and will not be made public. Unpublished papers are not in HowNet.

2. Not all doctoral dissertations will be collected in the background of HowNet database, which requires strict review. Well-written doctoral dissertations will be selected, and doctoral dissertations that can be used as reference will become papers collected by HowNet. All doctoral dissertations can be included in the database of HowNet, and a confidentiality agreement will be signed with HowNet.

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