?url_ver=Z39.88-2004&rft_id=doi%3A10.1190%2F1.1441200&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Mason%2C+I.+M.&rft.aulast=Mason&rft.aufirst=I.+M.&rft.issue=3&rft.volume=46&rft.date=March+1981&rft.issn=0016-8033&rft.atitle=Algebraic+reconstruction+of+a+two%E2%80%90dimensional+velocity+inhomogeneity+in+the+High+Hazles+seam+of+Thoresby+colliery&rft.title=GEOPHYSICS&rft.pages=298-308&rft.genre=article