Ferrario, Lilia2015-12-130035-8711http://hdl.handle.net/1885/72269Observations of main-sequence stars conducted over the last several decades have clearly shown that something like 50 per cent of stars of spectral types G and F occur in multiple systems. For earlier spectral types, the incidence of multiplicity is evenAuthor/s retain copyrightKeywords: Binaries: general; Stars: formation; Stars: low-mass; White dwarfs201210.1111/j.1365-2966.2012.21836.x2016-02-24