@article{eage:/content/papers/10.3997/2214-4609-pdb.154.047, author = "Candy, L.", title = "Electromagnetic measurement of coal roof-beam thickness", journal= "", year = "2005", volume = "", number = "", pages = "", doi = "https://doi.org/10.3997/2214-4609-pdb.154.047", url = "https://www.earthdoc.org/content/papers/10.3997/2214-4609-pdb.154.047", publisher = "European Association of Geoscientists & Engineers", issn = "2214-4609", type = "", eid = "cp-154-00054", }