(c) 2004, 2005 Stepan Roh (PUBLIC DOMAIN)
(c) 2009 Alexey Kryukov
(c) 2018-2020 Khaled Hosny
(c) 2018 Skef Iterum
(c) 2020 Waldir Pimenta
(c) 2020-2021 Caleb Maclennan
(c) 2020-2021 Fredrick R. Brennan
