547.7 Will U Williams, John Warren, 1898- Ultracentrifugation of macromolecules; modern topics [by] J. W. Williams. New York, Academic Press, 1972 xvii, 118 p. ilus. 24 cm. Bibliografía al final de los capítulos <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof1100395" property = "oa:link" href="http://www.worldcat.org/oclc/993339894 ">WorldCat</a>