@article{AlonsoCastroHauserKoutschan18,
 author = {Mariemi E. Alonso and Francisco J. Castro-Jim\'{e}nez and Herwig Hauser and Christoph Koutschan},
 title = {Echelons of power series and {G}abrielov's counterexample to nested linear {A}rtin approximation},
 journal = {Bulletin of the London Mathematical Society},
 isbn_issn = {ISSN 0024-6093},
 year = {2018},
 volume = {50},
 number = {4},
 pages = {649--662},
 doi = {10.1112/blms.12162},
}