Cita APA (7a ed.)

foF2 variations with R12 solar index: Kaliningrad. [s.l.].

Cita Chicago Style (17a ed.)

FoF2 Variations with R12 Solar Index: Kaliningrad. [s.l.]: [s.l.].

Cita MLA (9a ed.)

FoF2 Variations with R12 Solar Index: Kaliningrad. [s.l.].