Colombo, G. (1965). “Rotational Period of the Planet Mercury”. Nature (Springer Science and Business Media LLC) 208 (5010): 575. doi:10.1038/208575a0. ISSN0028-0836.
Colombo, G. (1965). “Rotational Period of the Planet Mercury”. Nature (Springer Science and Business Media LLC) 208 (5010): 575. doi:10.1038/208575a0. ISSN0028-0836.