@inbook{f39ce8f1d4624e6e8166433fdcf778ca,
title = "ISRM suggested method for the needle penetration test",
keywords = "Boekdeel internat.wet",
author = "R Ulusay and O Aydan and ZA Erguler and DJM Ngan-Tillard and T Seiki and W Verwaal and Y Sasaki and A Sato",
year = "2015",
doi = "10.1007/978-3-319-07713-0",
language = "English",
isbn = "978-3-319-07712-3",
pages = "143--155",
editor = "R Ulusay",
booktitle = "The ISM suggested methods for rock characterization, testing and monitoring: 2007-2014",
publisher = "Springer",
address = "Germany",
}