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On invariants of continuous subgroups of the generalized Poincaré group P ( 1 , 4 ) . Fedorchuk, V. (2002) Zeszyty Naukowe Uniwersytetu Jagiellońskiego. Universitatis Iagellonicae Acta Mathematica
On Kato's inequality for the Weyl quantized relativistic Hamiltonian. Takashi Ichinose, Tetsuo Tsuchida (1992) Manuscripta mathematica
On the essential spectrum of many-particle pseudorelativistic Hamiltonians with permutational symmetry account. Zhislin, Grigorii (2006) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Opérateur de diffraction pour le système de Maxwell en métrique de Schwarzschild Alain Bachelot (1990) Journées équations aux dérivées partielles