Johnson, H M <br/><br/>
Enhanced contrast in electron microscopy of unstained biological material. 3. In-focus phase contrast of large objects.  [electronic resource] 

 -  Journal of microscopy  May 1973 
 - 1-17 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0022-2720 
<br/><br/><label>Standard No.: </label>10.1111/j.1365-2818.1973.tb03799.x  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Image Enhancement<br/>Mathematics<br/>Methods<br/>Microscopy, Electron<br/>Microscopy, Phase-Contrast