PT  - JOURNAL ARTICLE
ED  - , 
TI  - Products & Materials
AID  - 10.1126/science.246.4926.143
DP  - 1989 Oct 06
TA  - Science
PG  - 143--143
VI  - 246
IP  - 4926
4099  - http://science.sciencemag.org/content/246/4926/143.short
4100  - http://science.sciencemag.org/content/246/4926/143.full
SO  - Science1989 Oct 06; 246