26. Health and Safety Guide 606,390 PYRROLIZIDINE Pyrrolizidine alkaloids i health and safety guide / IPCS International Programme on Chemical Safety, United Nations Environment Programme, International Labour Organisation, World Health Organization. -Geneva : WHO, 1989. - 20 s. ; 21 cm. - (Health and Safety Guide, ISSN 0259-7268 , no. 26) ISBN 92-4-154347-7