Eigenwerttheorie gewöhnlicher Differentialgleichungen Hochschultext Autor K. Jörgens et al. mar 1976 Paperback Preț: 478.39 lei 6-8 săpt.
Spectral Properties of Hamiltonian Operators Lecture Notes in Mathematics, nr. 313 Autor K. Jörgens et al. 19 feb 1973 Paperback Preț: 270.33 lei 6-8 săpt.