By Somerville David   Shapley John   in Catalysis Letters

ISSN:1011-372X|52|3-4|123-129

Springer Publishing Company ‎(1998)‎

Access to resources Favorite 13.197442

By Shapley John J.   Kyker Robert A.   Ferrell Kenneth R.   in Journal of the American Helicopter Society

ISSN:2161-6027|15|2|30-38

AHS International‎(1970)‎

Access to resources Favorite 7.4225435