@article{Kłusek-Gawenda:2014Zx, author = "Kłusek-Gawenda, Mariola", title = "{Exclusive production of two and four pions in ultraperipheral, ultrarelativistic collisions}", doi = "10.22323/1.180.0020", journal = "PoS", year = 2014, volume = "EPS-HEP 2013", pages = "020" }