The American mathematical monthly, vol.127, no.6-10 (2020) 

 - USA:  Mathematical Association of America,  2020. 
 - 01.06.2020 - 31.12.2020 
<br/><br/><label>ISSN: </label>0002-9890        
<br/><br/><label>Dewey Class. No.: </label>510.5  / AME