References
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- Noethe , L. , Franza , F. , Giordano , P. , Wilson , R.N. , Citterio , O. , Conti , G. and Mattaini , E. 1988 . J. mod. Optics , 35 : 1427 – 1427 .
- Schwesinger , G. 1988 . J. mod. Optics , 35 : 1117 – 1117 .
- Wilson , R.N. , Franza , F. and Noethe , L. 1984 . Proceedings of the IAU Colloquium no. 79: Very Large Telescopes, their Instrumentation and Programs , Edited by: Ulrich , M.-H. and Kjär , K. 23 – 23 . ESO .
- Merkle , F. 1988 . Proceedings of the ESO Conference on Very Large Telescopes and their Instrumentation , Edited by: Ulrich , M.-H. 639 – 639 . ESO .