In a virtual ground semiconductor memory device such as an EPROM or a Flash EPROM, a program disturb inhibited unit is operatively connected to a memory array. The memory array includes a plurality of metal virtual ground and bit lines, with at least two bit line selection transistors connected to each...http://www.google.de/patents/US6175519?utm_source=gb-gplus-sharePatent US6175519 - Virtual ground EPROM structure
