$a Kp. Vitamin B12 and B12-proteins : lectures presented at the 4th European Symposium on Vitamin B12 and B12-proteins / edtited by Bernhard Kräutler, Duilio Arigoni and Bernard T. Golding ; [with a foreword by Albert Eschenmoser]. - Weinheim [etc.], cop. 1998. $b Okł. : (with a foreword by Albert Eschenmoser)