title: Observational upper limits to the electromagnetic energy radiated by normal galaxies.
authors.affiliation: Astronomical Institute of the Czechoslovak Academy of Sciences, Prague, Czechoslovakia.
authors.forename: M O
authors.initials: MO
authors.lastname: Harwit
authors.forename: J R
authors.initials: JR
authors.lastname: Houck
authors.forename: R V
authors.initials: RV
authors.lastname: Wagoner