J
Jay Reynolds
Guest
This paper by Ulrich Schumann is an excellent and fairly concise while high level discussion of what is known about contrails.
http://www.aero-net.info/fileadmin/aeronet_files/links/documents/DLR/Schumann_Contrails.pdf
http://www.aero-net.info/fileadmin/aeronet_files/links/documents/DLR/Schumann_Contrails.pdf