Observationer av "noctilucent clouds", Danmark 2011

Dubietis, A., Dalin, P., Balciunas, R., Cernis, K., Pertsev, N., Sukhodoev, V., Perminov, V., Zalcik, M., Zadorozhny, A., Connors, M., Schofield, I., McEwan, T., McEachran, I., Frandsen, S., Hansen, O., Andersen, H., Grönne, J., Melnikov, D., Manevich, A., and Romejko, V.: Noctilucent clouds: modern ground-based photographic observations by a digital camera network, Applied Optics, 50, 28, F72-F79, doi:10.1364/AO.50.000F72, 2011.