Media type: E-Article Title: Ordinary and Partial Differential Equations: Partial differential equations related to extremal problems for quasiconformal mappings Contributor: Cazacu, Cabiria Andreian imprint: Springer Berlin Heidelberg, 1974 Published in: Ordinary and Partial Differential Equations Language: Not determined DOI: 10.1007/bfb0065506 ISSN: 0075-8434; 1617-9692 Origination: Footnote: