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		| Paper: | 
		Simulation of Systematic Observational Errors in Orbit Computation. Theorem of the Proper Direction(s) of an Orbital Element | 
	 
	
		| Volume: | 
		63, Seventy-five Years of Hirayama Asteroid Families: The Role of Collisions in the Solar System History | 
	 
	
		| Page: | 
		15 | 
	 
	
		| Authors: | 
		Debehogne, H. | 
	 
	
	
		| Abstract: | 
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