@proceedings {73152,
	title = {Field theory analysis of microstrip circulator using finite element method},
	journal = {National chiao tung University},
	year = {1993},
	address = {Hsinchu, Taiwan},
	author = {Esmat A.F. Abdallah and Mostafa E-Mostafa and Ahmed A.N. Ahmed and Deena A.M. Salem}
}
