المؤلفون: Huntington, A. K., Lowry, T. M., Harker, J. A., Whipple, R. S., The Chairman, Day, Arthur L.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______2659::b9ebecff7d706e6029037225a73b4b4ahttps://zenodo.org/record/1952217
المؤلفون: Day, Arthur L., Shepherd, E. S.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______2659::ccc1e92a283cfbc53737889cb2e91dd2https://zenodo.org/record/2043881