Description: Blad ECN
| Magazine | Date | Articles |
|---|---|---|
| Energie Spectrum | January 1981 | 2 |
| Energie Spectrum | February 1981 | 3 |
| Energie Spectrum | March 1981 | 7 |
Energie Spectrum  | April 1981 | 6 |
| Energie Spectrum | May 1981 | 4 |
| Energie Spectrum | September 1981 | 1 |
| Energie Spectrum | October 1981 | 5 |
| Energie Spectrum | November 1981 | 5 |
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