@book{3221,
	author = {Casas, Willie and Zurbano, Joel E.},
	title = {2 variants blamed for upsurge /},
	url = {http://elibrary.doh.gov.ph/cgi-bin/koha/opac-retrieve-file.pl?id=6935c60ff24c7cdd3abec163f74c4c1d}
}