Sergio Cortesi et al.: Sunspot observations and counting at Specola Solare Ticinese in Locarno since 1957. In: Solar Physics, 2016, arxiv:1602.07998, doi:10.1007/s11207-016-0872-7.
doi.org
Sergio Cortesi et al.: Sunspot observations and counting at Specola Solare Ticinese in Locarno since 1957. In: Solar Physics, 2016, arxiv:1602.07998, doi:10.1007/s11207-016-0872-7.
