Title:  Optimality of Euler’s elasticae 
 Authors:  Yu. L. Sachkov 
 Journal title:  Doklady Mathematics 
 Year:  2007 
 Issue:  3 
 Volume:  76 
 Pages:  817 – 819 
 Abstract:  
Euler’s problem of stationary configurations of an elastic rod with fixed endpoints and tangents at the end-points is considered. The existence and boundedness of optimal controls are proved. Bounds on the cut points and conjugate points are obtained
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