534,981 CERVM ERIK Demonstration and characterization of ecto—sialyltransferase in surface membranes of intact Ehrlich ascites tumour cells-. Uppsala 1979 Almqvist and Wiksall 8- s. 57, il + wkł. s. nlb. 2 Acta Universitatis Upsaliensis Abstracts of Uppsala Dissertations Faculty of Medicine 341 Doctoral dissertatio