Legal security as the purpose of post-arbitration litigation - perspective of Polish and Swedish arbitration laws [in:] S. Makūnaitė, J. Randakevičiūtė, G. Tamašauskaitė-Janickė, V. Vėbraitė (ed.), Security as the purpose of law: 3rd international conference of PhD students and young researchers, 9-10 April 2015, Vilnius, Lithuania: conference papers