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4. ANON. (Texas A and M Univ., College Station, TX (USA). Dept. of Nuclear Engineering): Aerosol microphysics of indoor radon. Annual update, 1 October 1988–31 August 1989. DOE/ER/60550-3. Contract FG05-87ER60550. 1989. 3 p. MF available from INIS. Available from NTIS, PC A02/MF A01 as DE89017359; OSTI; INIS; US Govt. Printig Office Dep. (RN 21:013855).
5. ANON. (National Radiological Protection Board, Chilton (UK)): Board statement on radon in homes. ISBN 0-89591-322-X. London (UK). H. M. Stationery Office. 1990. 32 p. Documents of the NRPB. v. 1(1). (RN 21:039659).