@ARTICLE{
author={Aktas A,Andreev Vladimir A,Anthonis T,Antunovic B,Aplin S,Asmone A,Astvatsatourov A,Babaev A,Backovic S,Baghdasaryan A,Baranov P,Barrelet E,Bartel W,Baudrand S,Baumgartner S,Becker J,Beckingham M,Behnke O,Behrendt O,Belousov A},
year={2006},
title={Search for doubly-charged Higgs boson production at HERA},
journal={PHYSICS LETTERS B},
volume={638},
number={5-6},
pages={432-440},
document_type={Article},
} 

@ARTICLE{
author={Aktas A,Andreev Vladimir A,Anthonis T,Antunovic B,Aplin S,Asmone A,Astvatsatourov A,Babaev A,Backovic S,Baghdasaryan A,Baranov P,Barrelet E,Bartel W,Baudrand S,Baumgartner S,Becker J,Beckingham M,Behnke O,Behrendt O,Belousov A},
year={2006},
title={Diffractive photoproduction of rho mesons with large momentum transfer at HERA},
journal={PHYSICS LETTERS B},
volume={638},
number={5-6},
pages={422-431},
document_type={Article},
}