You may also wish to search for items by Nielson, R. and Nielson.
Only one matching reference was found.
Stewart, W.C.; Nielson, R.F., Phase equilibria for mixtures of carbon dioxide and several normal saturated hydrocarbons, Bull.- Earth Mineral Sci. Exp. Stn., Penn. State Univ. No. 62, 19-29, 1953. [all data]