@article{oai:tsukuba.repo.nii.ac.jp:00016268, author = {Popescu, Liliana and Popescu, Nicolae}, issue = {1}, journal = {Tsukuba Journal of Mathematics}, month = {Jun}, pages = {57--78}, title = {On the residual transcendental extensions of a valuation. Key polynomials and augmented valuation}, volume = {15}, year = {1991} }