Grubb, Gerd, and Geymonat, Giuseppe. "The Essential Spectrum of Elliptic Systems of Mixed Order.." Mathematische Annalen 227 (1977): 247-276. <http://eudml.org/doc/162979>.
@article{Grubb1977, author = {Grubb, Gerd, Geymonat, Giuseppe}, journal = {Mathematische Annalen}, pages = {247-276}, title = {The Essential Spectrum of Elliptic Systems of Mixed Order.}, url = {http://eudml.org/doc/162979}, volume = {227}, year = {1977}, }
TY - JOUR AU - Grubb, Gerd AU - Geymonat, Giuseppe TI - The Essential Spectrum of Elliptic Systems of Mixed Order. JO - Mathematische Annalen PY - 1977 VL - 227 SP - 247 EP - 276 UR - http://eudml.org/doc/162979 ER -