PT  - JOURNAL ARTICLE
ED  - , 
TI  - Products & Materials
AID  - 10.1126/science.248.4962.1566
DP  - 1990 Jun 22
TA  - Science
PG  - 1566--1566
VI  - 248
IP  - 4962
4099  - http://science.sciencemag.org/content/248/4962/1566.short
4100  - http://science.sciencemag.org/content/248/4962/1566.full
SO  - Science1990 Jun 22; 248