N R Njeze ; S O Ike ; I U Abah.. http://www.ijmhdev.com/article.asp?issn=2635-3695;year=2015;volume=20;issue=1;spage=30;epage=33;aulast=Njeze;type=0.
,
2015
S Ocheni ; O G Ibegbulam ; D B Olusina.. http://www.ijmhdev.com/article.asp?issn=2635-3695;year=2012;volume=17;issue=1;spage=59;epage=64;aulast=Ocheni;type=0.
,
2012