2014 · И.Я. Сигал, А.В. Марасин, et al. · The scientific electronic library of periodicals of the National Academy of Sciences of Ukraine (National Academy of Sciences of Ukraine)
2013 · И.Я. Сигал, А.В. Смихула, et al. · The scientific electronic library of periodicals of the National Academy of Sciences of Ukraine (National Academy of Sciences of Ukraine)
2010 · И.Я. Сигал, А.В. Смихула, et al. · The scientific electronic library of periodicals of the National Academy of Sciences of Ukraine (National Academy of Sciences of Ukraine)
2010 · И.Я. Сигал, А.Н. Дубоший, et al. · The scientific electronic library of periodicals of the National Academy of Sciences of Ukraine (National Academy of Sciences of Ukraine)