Hopke, P K <br/><br/>
Inconsistency in the length of a working month.  [electronic resource] 

 -  Health physics  Oct 1992 
 - 466-7 p.  digital 
<br/><br/> Publication Type: Letter 
<br/><br/><label>ISSN: </label>0017-9078 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans<br/>Occupational Exposure--analysis<br/>Radon--analysis<br/>Time Factors