Their paper was submitted in 1983 .
Their paper was published in 1984 , the same year that Dan Shechtman and his co-workers announced the experimental discovery of an alloy with icosahedral quasi-crystalline structure .
Their paper was submitted in 1983 and published in 1984 , the same year that Dan Shechtman and his co-workers announced the experimental discovery of an alloy with icosahedral quasi-crystalline structure .