"Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneously Trapped Particles",
G. Gabrielse, A. Khabbaz, D.S. Hall, C. Heimann, H. Kalinowsky and W. Jhe;
Phys. Rev. Lett. 82, 3198 (1999).
        The most stingent test of CPT invariance with baryons also demonstrates the sensitive
          radiofrequency diagnostics that will be used to monitor the ingredients of cold antihydrogen.

"The Ingredients of Cold Antihydrogen: Simultaneous Confinement of Antiprotons and Positrons at 4K",
G. Gabrielse, D.S. Hall, T. Roach, P. Yesley, A. Khabbaz, J. Estrada, C. Heimann, and H. Kalinowsky;
Phys. Lett. B 455, 311 (1999).
        First time that cold antiprotons and positrons have occupied the same vacuum container
          and been made to interact.

"Observing the Quantum Limit of an Electron Cyclotron: QND Measurements of Quantum Jumps Between Fock States",
S. Peil and G. Gabrielse;
Phys. Rev. Lett. 83, 1287 (1999).
        Demonstration (with electrons) of techniques that will be used to confine and cool antiprotons
          and positrons at 70 mK temperatures, the first time that charged particles have ever been
          stored at temperatures below 4.2 K.

"Continuous Wave Coherent Lyman-alpha Radiation",
K.S.E. Eikema, J. Walz, and T.W. Haensch
Phys. Rev. Lett. 83, 3828 (1999).
        First demonstration of a coherent source of Lyman alpha radiation.
          This source was developed for antihydrogen spectroscopy and cooling.

"Field ionization of Strongly Magnetized Rydberg Positronium: A New Physical Mechanism for Positron Accumulation",
J. Estrada, T. Roach, J.N. Tan, P. Yesley and G. Gabrielse;
Phys. Rev. Lett. 84, 859 (2000).
        Most efficient mechanism yet demonstrated for accumulating 4.2 K positrons
          in the cyrogenic vacuum desired for the production of cold antihydrogen.

"Field-Induced Electron-Ion Recombination, a Novel Route Towards Neutral (Anti-)Matter"
C. Wesdorp, F. Robicheaux, L.D. Noordam
Phys. Rev. Lett. 84, 3799 (2000).
        Demonstration (with electrons and ions) of a recombination mechanism
          that may allow the efficient production of cold antihydrogen.

"First Positron Cooling of Antiprotons"
G. Gabrielse, J. Estrada, J.N Tan, P. Yesley, N.S. Bowden, P. Oxley, T. Roach, C.H. Storry, M. Wessels, J. Tan, D. Grzonka, W. Oelert, G. Schepers, T. Sefzick, W.H. Breunlich, M. Cargnelli, H. Furhmann, R. King, R. Ursin, J. Zmeskal, H. Kalinowsky, C. Wesdorp, J. Walz, K.S.E. Eikema, T.W. Haensch
Phys. Lett. B 507, 1 (2001)
        Cold trapped positrons cool antiprotons to a low relative velocity with
          the positrons.  Likely cold antihydrogen is produced during this cooling,
          though it has yet to be observed unambiguously.

"Stability of a Charged Particle in a Combined Penning-Ioffe Trap"
T.M Squires, P. Yesley, G. Gabrielse
Phys. Rev. Lett. 86, 5266 (2001)
        Theoretical emonstration that antiprotons and positrons, at low density,
          follow stable orbits in a trap able to trap antihydrogen and its ingredients.

"Stacking of Cold Antiprotons"
G. Gabrielse, N.S. Bowden, P. Oxley, A. Speck, C.H. Storry, J.N. Tan, M. Wessels, D. Grzonka, W. Oelert, G. Schepers, T. Sefzick,  J. Walz, H. Pittner, T.W. Haensch, E.A. Hessels
Phys. Lett. B 548, 140 (2002)
        Demonstration of a way to accumulate enough cold antiprotons to for cold antihydrogen
         and other low energy experiments..        

"Background-Free Observation of Cold Antihydrogen and a Field-Ionization Analysis of Its States"
G. Gabrielse, N.S. Bowden, P. Oxley, A. Speck, C.H. Storry, J.N. Tan, M. Wessels, D. Grzonka, W. Oelert, G. Schepers, T. Sefzick,  J. Walz, H. Pittner, T.W. Haensch, E.A. Hessels
Phys. Rev. Lett. 89, 213401 on line (2002)
       
"Driven Production of Cold Antihydrogen and the First Measured Distribution of Antihydrogen States"
G. Gabrielse, N.S. Bowden, P. Oxley, A. Speck, C.H. Storry, J.N. Tan, M. Wessels, D. Grzonka, W. Oelert, G. Schepers, T. Sefzick,  J. Walz, H. Pittner, T.W. Haensch, E.A. Hessels
Phys. Rev. Lett. (in press)