Electronics Letters
Electronics Letters > 1970 > 6 > 21 > 664 - 665
Electronics Letters > 1970 > 6 > 25 > 809 - 810
Electronics Letters > 1970 > 6 > 25 > 800 - 801
Electronics Letters > 1970 > 6 > 25 > 815 - 816
Electronics Letters > 1970 > 6 > 26 > 832 - 833