MathSciNet bibliographic data MR113026 (22 #3867) 35.00 Agudo, Fernando Roldão Dias; Wolf, František Propriétés spectrales de l'opérateur $${\partial\sp 2\over \partial x\sp 2}+{\partial\sp 2\over \partial y\sp 2}+{\partial\sp 2\over \partial z \sp 2}+a {\partial\over \partial x}+b{\partial\over \partial y}+ c{\partial\over \partial z}+d$$ á coefficients complexes. (French) Atti Accad. Naz. Lincei. Rend. Cl. Sci. Fis. Mat. Nat. 25 1958 273–275. Links to the journal or article are not yet available

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