Dow Jones: COMPANY NEWS; ENEL TO PAY $300 MILLION FOR ECHELON'S TECHNOLOGY. In: The New York Times. 11. Mai 2000, ISSN0362-4331 (nytimes.com [abgerufen am 23. April 2022]).
Dow Jones: COMPANY NEWS; ENEL TO PAY $300 MILLION FOR ECHELON'S TECHNOLOGY. In: The New York Times. 11. Mai 2000, ISSN0362-4331 (nytimes.com [abgerufen am 23. April 2022]).