1. Facility to grow plants;Anisimov;USSR author's certificate No. 1034681,1983
2. Facility To Grow Plants;Berkovich;USSR Author's Certificate No. 818563,1981
3. Facility To Grow Plants;Berkovich;USSR Author's Certificate No. 914004,1982
4. On Advantages of Space Greenhouses With Curvilinear Sowing Surfaces;Berkovich,1982