Darrel S. Metcalfe has written:

'Farm crops' -- subject(s): Field crops, Study and teaching

Metcalfe's Law

Edna Metcalfe has written:

'The trees of Christmas' -- subject(s): Christmas trees

Jean Metcalfe has written:

'Sunnylea' -- subject(s): Social life and customs

Indeed, Metcalfe's law states that the total value of a good or service that possesses a network effect is roughly proportional to the square of the number of customers already owning that good or using that service.