MAP20100088128 Bjuggren, Per-Olof Should a regulatory body control insurance policies ex ante or is ex post control more effective? / Per-Olof Bjuggren, Dan Magnusson and Carl Martin Roos En: Geneva papers on risk and insurance : issues and practice. - Geneva : The Geneva Association, 1976- = ISSN 1018-5895. - Tomo 19 Número 1 - 1994 I. Magnusson, Dan . II. Roos, Carl Martin .