605,402 LYRENAS SVEN Studies on endogenous opioid peptides in human cerebrospinal fluid at term pregnancy and in the puerperium : [doctoral diss.] / Sven Lyrenas ; [Uppsala University]. - Uppsala : Academiae Upsalien-sis, 1987. — 43 s. : wykr. ; 24 cm (Acta Universitatis Upsaliensis. Comprehensive Summaries of Uppsla Dissertations from the Faculty of Medicine ; 101) ISBN 91-554-2041-9 ISSN 0282-7476