This author has not been identified. Look up 'Ivan Bretan' in GoogleThis author has not been identified. Look up 'Leif Fredin' in GoogleThis author has not been identified. Look up 'Walter Frost' in GoogleThis author has not been identified. Look up 'Leif-Rune Hedman' in GoogleThis author has not been identified. Look up 'Per Kroon' in GoogleThis author has not been identified. Look up 'Scott McGlashan' in GoogleThis author has not been identified. Look up 'Eva-Lotta Sallnäs' in GoogleThis author has not been identified. Look up 'Markku Virtanen' in Google