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100   $a20020821d1973----km-y0itay50------ba
101 0 $aeng
105   $aa-------001yy
200 1 $aNegative electron affinity devices$fR. L. Bell
210   $aOxford$cClarendon press$d1973
215   $a148 p.$cill.$d23 cm
225 1 $aMonographs in electrical and electronic engineering
610 0 $aSemiconduttori
676   $a621.381'52
700  1$aBell,$bRobert L.
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