Electronics Letters
Electronics Letters > 1993 > 29 > 6 > 555 - 556
Electronics Letters > 1993 > 29 > 7 > 576 - 578
Electronics Letters > 1993 > 29 > 17 > 1498 - 1500
Electronics Letters > 1993 > 29 > 21 > 1851 - 1852
Electronics Letters > 2008 > 44 > 13 > 813 - 814