@article{BrungsGraeter2000, author = {Brungs, Hans and Gr{\"a}ter, Joachim}, title = {Trees and Valuation Rings}, year = {2000}, language = {en} } @article{GraeterKlein2000, author = {Gr{\"a}ter, Joachim and Klein, Markus}, title = {The Principal Axis Theorem for Holomorphic Functions}, year = {2000}, language = {en} }