Vladimir_roganov@mail.ru
mix1959@gmail.com
roganelka@mail.ru
grintsova_olga@mail.ru
jurijs.lavendels@.rtu.lv
© 2018 Vladimir Roganov, Michail Miheev, Elvira Roganova, Olga Grintsova, Jurijs Lavendels, published by Riga Technical UniversityThis work is licensed under the Creative Commons Attribution 4.0 License.