الإتاحة: https://doi.org/10.1016/S1567-4215Test(08)60568-8http://eurjhf.oxfordjournals.org/cgi/content/short/7/Suppl_1/206aTest
الإتاحة: https://doi.org/10.1016/S1567-4215Test(08)60298-2http://eurjhf.oxfordjournals.org/cgi/content/short/7/Suppl_1/108Test
الإتاحة: https://doi.org/10.1016/S1567-4215Test(08)60305-7http://eurjhf.oxfordjournals.org/cgi/content/short/7/Suppl_1/110bTest