@Misc{RANFE2009006526, title = "Pakist\'{a}n journal of Scientific and Industrial Research", publisher = "Karachi, Pakist\'{a}n : Pakist\'{a}n Council of Scientific \& Industrial Research", editor = "Pakist\'{a}n Council of Scientific \& Industrial Research", URL = "http://bibliotecavirtual.ranf.com/i18n/consulta/registro.do?id=6526", year = "1958", }