@inproceedings{Abramowicz:2012Na, author = "Abramowicz, Halina", title = "{Exclusive Electroproduction of two pions at HERA}", doi = "10.22323/1.134.0450", booktitle = "Proceedings of XXIst International Europhysics Conference on High Energy Physics {\textemdash} PoS(EPS-HEP2011)", year = 2012, volume = "134", pages = "450" }