This paper is published from NTNU (Norwegian University of Science and Technology).

Written by Egil Zahl Johansen

It is in English. I think this 9pdf.net is a Norwegian web site. I hope it is not a intellectual property piracy site. I am giving link in good faith but please check yourself.

https://9pdf.net/document/yj78lop5-tunneling-conditions-verification-estimation-assessment-performance-hydroelectric-powerplant.html