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De Biase GA, Paternò L, Pucillo M, et al. URSULA: a twin-beam multiband computer-controlled photometer for astronomical applications. Appl Opt. 1978;17(3):435-41doi: 10.1364/AO.17.000435.
De Biase, G. A., Paternò, L., Pucillo, M., & Sedmak, G. (1978). URSULA: a twin-beam multiband computer-controlled photometer for astronomical applications. Applied optics, 17(3), 435-41. https://doi.org/10.1364/AO.17.000435
De Biase, G A, et al. "URSULA: a twin-beam multiband computer-controlled photometer for astronomical applications." Applied optics vol. 17,3 (1978): 435-41. doi: https://doi.org/10.1364/AO.17.000435
De Biase GA, Paternò L, Pucillo M, Sedmak G. URSULA: a twin-beam multiband computer-controlled photometer for astronomical applications. Appl Opt. 1978 Feb 01;17(3):435-41. doi: 10.1364/AO.17.000435. PMID: 20174426.
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