Harlequin Duck

Mihail Ivanov(important), Denis & Raisa Sayfutdinov(important), Sergey L. Volkov(interesting), Alexey Denisov(interesting), Igor Fefelov(important), Igor Fefelov(interesting), Mishail Belousow(interesting), Andrey Bazdyrev(interesting), Nadejda Popova(interesting), Valerii Bogdanovich(important), Nina Bredihina(interesting), Alexandr Kochetkov(important), Pavel Zhovtyuk(interesting), Nina Shteinbrenner(interesting)