%0 Journal Article %A Clarke, Frank H. %T The Erdmann Condition and Hamiltonian Inclusions in Optimal Control and the Calculus of Variations %J Canadian journal of mathematics %D 1980 %P 494-509 %V 32 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-039-9/ %R 10.4153/CJM-1980-039-9 %F 10_4153_CJM_1980_039_9