Hoyle C.R., Webster C.S., Rieder H.E., Nenes A., Hammer E., Herrmann E., Gysel M., Bukowiecki N., Weingartner E., Steinbacher M. and Baltensperger U.: Chemical and physical influences on aerosol activation in liquid clouds: a study based on observations from the Jungfraujoch, Switzerland, , Atmospheric Chemistry and Physics Vol 16 p.4043–4061,