F. C. Erné

Single and Multi-Photon Events with Missing Energy in {\boldmath \epem} Collisions at {\boldmath \rts\ = 189 \gev

F. L. Linde, A. P. Colijn, P. de Jong, 1999 .

χc2 formation in two-photon collisions at LEP

Emilio Leonardi, William J. Burger, K. Lassila-Perini, 1999 .