Main restrictions in the synthesis of new superheavy elements: Quasifission and/or fusion fission Avazbek Nasirov, Kyungil Kim, Giuseppe Mandaglio, Giorgio Giardina, Akhtam Muminov and Youngman Kim Eur. Phys. J. A, 49 11 (2013) 147 Published online: 21 November 2013 DOI: 10.1140/epja/i2013-13147-y