eng Science and Education Publishing Journal of Finance and Economics 2328-7276 2018-08-06 6 4 124 124 10.12691/jfe-6-4-1 JFE2018641 article Special Issue on Longevity Risk and Insurance Marta Borda Patrycja Kowalczyk-Rólczyńska http://pubs.sciepub.com/jfe/6/4/1/jfe-6-4-1.pdf