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4. ANDERSEN, C. E. (Risoe National Lab., Roskilde (Denmark). Nuclear Safety Research Dept.; Technical Univ. of Denmark, Lyngby (Denmark)): Entry of soil gas and radon into houses. Thesis (Ph.D.). (English). RISO-R-623. ISBN 98-550-1804-1. Apr 1992. 86 p. MF available from INIS. Also available from Risoe Library, DK-4000 Roskilde, Denmark. (RN 24:005711).
5. ANON.: H. R. 3258: This Act may be cited as the Radon Avareness and Disclosure Act of 1991, introduced in the US House of Representatives, One Hundred Second Congress, First Session, August, 2, 1991. (English). Washington, DC (United States). Government Printing Office. 1991. 20 p. (RN 24:010387).