Aharonian, F. A.: Sources of very high energy gamma rays. International Symposium "Astrophysics and Cosmology after Gamow - Theory and Observations", Odessa, Ukraine (2004)

Völk, H. J.: Origin of the Galactic Cosmic Rays and Gamma-Ray Astronomy. 3rd International Workshop on Ultra High Energy Cosmic Rays, Leeds, U.K. (2004)

Hirotani, K.: Theories of High-energy Emission from Pulsars. 35th COSPAR Scientific Assembly, Paris, France (2004)

Kirk, J. G.: New insights into pulsar magnetospheres and winds? COSPAR Scientific Assembly, Paris, France (2004)

Aharonian, F. A.: TeV gamma rays from the Galactic Center: Direct and indirect links to the massive Black Hole in Sgr A*. International Workshop "From X-ray Binaries to Quasars: Black Hole Accretion on All Mass Scales, Amsterdam, Netherlands (2004)

Hampel, W.: Was haben wir von den Sonnenneutrinos über Neutrino-Oszillationen gelernt? Physikalisches Kolloquium, Justus-Liebig-Universität Giessen (2004)

Aharonian, F. A.: Astrophysics with Ground Based Gamma Ray Detectors. 14th Course of the International School of Cosmic Ray Astrophysics, Erice, Sicilia (2004)

Aharonian, F. A.: Observational Gamma Ray Cosmology. 14th Course of the International School of Cosmic Ray Astrophysics, Erice, Sicilia (2004)

Schönert, S.: Low energy neutrino and cold dark matter detection. International Conference on the Seesaw Mechanism (SEESAW25), Institut Henri Poincaré, Paris (2004)

Aharonian, F. A.: Searching for Cosmic PeVatrons in the Galactic Disk with hard X-Rays and Ultra-High Energy Gamma-Rays. International Workshop on "Multiwavelength approach to unidentified gamma-ray sources, Hong Kong (2004)

Völk, H. J.: Gamma-ray emission from Supernova Remnants. International Workshop on "Multiwavelength approach to unidentified gamma-ray sources, Hong Kong (2004)

Kirk, J. G.: Particle Acceleration in GRB and AGN. Colloquium an der University of Valencia, Valencia, Spain (2004)

Costamante, L.: TeV BL Lacs with H.E.S.S. 6th Italian AGN Conference, Volterra, Italy (2004)

Hirotani, K.: Gamma-ray emission from outer-gap accelerators. Workshop on Rotation-powered Pulsars and their Environment, Heidelberg, Germany (2004)

Kirk, J. G.: Radiation from pulsar winds. Workshop on Rotation-powered Pulsars and their Environment, Heidelberg, Germany (2004)

Völk, H. J.: Das H.E.S.S.-Projekt der Gamma-Astronomie in Namibia. Namibia Tag der Deutsch-Namibischen Gesellschaft, Heidelberg, Germany (2004)

Motta, D.; Buck, C.; Hartmann, F. X.; Lasserre, T.; Schönert, S.; Schwan, U.: Results of the LENS pilot phase. DPG Spring Meeting, Köln/Mainz (2004)

Buck, C.; Hartmann, F. X.; Motta, D.; Schoenert, S.: Ein Gd-beladener Flüssigszintillator zum Antineutrinonachweis. DPG Frühjahrstagung, Mainz, Germany (2004)

Schönert, S.: Plans for double beta decay search with a new Germanium-76 experiment at LNGS. Kolloquium at Institute for Nuclear Problems JINR, Dubna, Russia (2004)

Kirk, J. G.: Particle Acceleration. X-ray and radio connections, Santa Fe, New Mexico, U.S.A. (2004)