Reference material

I have made some reference papers available from the "timeplan": The Scharmer 1981 paper on his approximate operator, Rybicki & Hummer 1991 on their operator (both links in the pensum column for February 5), a classical paper on contribution functions and response functions by Magain 1986 and a paper on the non-LTE abundance determination of Lithium (Carlsson et al 1994) (the two last links in the pensum column of February 12).