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		| Paper: | 
		Discussion Session 4a: Structure and Dynamics of Circumstellar Disks | 
	 
	
		| Volume: | 
		361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics | 
	 
	
		| Page: | 
		256 | 
	 
	
		| Authors: | 
		Owocki, S.P. | 
	 
	
	
		| Abstract: | 
		Discussion of materials presented in the first portion of Session 4. | 
	 
	
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