Spektrofotometricheskie issledovanii︠a︡ aktivnykh obrazovaniĭ na solnt︠s︡e
by E. P. Fedorov, Holovna astronomichna observatorii︠a︡ (Akademii︠a︡ nauk Ukraïnsʹkoï RSR)
Solar SpectrumAstronomical photometry
Writing a summary for young readers…
For young readers
Book data: Open Library