Caliceti, Emanuela; Graffi, Sandro, Criteria for the reality of the spectrum of PT-symmetric Schroedinger operators and for the existence of PT-symmetric phase transitions, in: Non-Selfadjoint Operators in Quantum Physics, Hoboken, New Jersey, John Wiley & Sons, 2015, pp. 189 - 240 [Chapter or essay]
E. Caliceti; S. Graffi, An existence criterion for the PT -symmetric phase transition, «DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS. SERIES B.», 2014, 19, pp. 1955 - 1967 [Scientific article]
E. Caliceti; S. Graffi, Convergent quantum normal forms, PT-symmetry and reality of the spectrum, «ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI. RENDICONTI LINCEI. MATEMATICA E APPLICAZIONI», 2013, 24, pp. 385 - 407 [Scientific article]
E.Caliceti; S.Graffi; M.Hitrik; J.Sjoestrand, Quadratic PT -symmetric operators with real spectrum and similarity to self-adjoint operators, «JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL», 2012, 45, pp. 444007 - 444027 [Scientific article]
E. Caliceti; F. Cannata; S. Graffi, PT Symmetric Schroedinger Operators: Reality of the Perturbed Eigenvalues, «SYMMETRY, INTEGRABILITY AND GEOMETRY: METHODS AND APPLICATIONS», 2010, 6, 009, pp. 1 - 8 [Scientific article]
E. Caliceti; S. Graffi, Reality and non-reality of the spectrum of PT -symmetric operators: Operator-theoretic criteria, «PRAMANA-JOURNAL OF PHYSICS», 2009, 73, No. 2, pp. 241 - 249 [Scientific article]
E. Caliceti; S. Graffi, A criterion for the reality of the spectrum of PT-symmetric Schrödinger operators with complex-valued periodic potentials, «ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI. RENDICONTI LINCEI. MATEMATICA E APPLICAZIONI», 2008, 19, pp. 163 - 173 [Scientific article]
E. Caliceti; F. Cannata; S. Graffi, An analytic family of PT-symmetric Hamiltonians with real eigenvalues, «JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL», 2008, 41, pp. 244008 - 244013 [Scientific article]
E. Caliceti; P. Contucci; M. Degli Esposti; M. Lenci, Meccanica: A conference in honor of Sandro Graffi on the occasion of his 65th birthday, 2008. [Exhibition]
E. Caliceti; M. Meyer-Hermann; P. Ribeca; A. Surzhykov; U. Jentschura, From useful algorithms for slowly convergent series to physical predictions based on divergent perturbative expansions., «PHYSICS REPORTS», 2007, 446, pp. 1 - 96 [Scientific article]
E.Caliceti; S.Graffi; J.Sjoestrand, PT symmetric non-selfadjoint
operators, diagonalizable and non-diagonalizable, with real discrete spectrum, «JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL», 2007, 40, pp. 10155 - 10170 [Scientific article]
E.Caliceti; F.Cannata; S.Graffi; F.Ravanini, 5th- International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics, 2006. [Exhibition]
E. Caliceti; F. Cannata; A. Graffi; F. Ravanini, 7th Bologna workshop on Conformal Field Theory and Integrable Models, 2006. [Exhibition]
E. Caliceti; F. Cannata; S. Graffi, Perturbation theory of PT-symmetric Hamiltonians, «JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL», 2006, 39, pp. 10019 - 10027 [Scientific article]
B. Bagchi; A. Banerjee; E. Caliceti; F. Cannata; H. B. Geyer; C. Quesne; M. Znojil, CPT-conserving Hamiltonians and their nonlinear supersymmerization using differential charge operators C, «INTERNATIONAL JOURNAL OF MODERN PHYSICS A», 2005, 20, pp. 1 - 22 [Scientific article]
