1. 
   Ivanov, Lev
   Russian ballet dancer who was choreographic assistant to Marius Petipa, the director and chief choreographer of the Imperial Russian Ballet.
   Found op http://www.britannica.com/eb/a-z/i/48
   
   
2. 
   Ivanov, Lev
   Ivanov, Lev (lyef ēvä'nôf) , 1834–1901, Russian dancer, teacher, choreographer, and ballet-master. Ivanov was assistant to chief ballet-master Marius Petipa at the Imperial St. Petersburg Theatres and was instrumental in the development of the classic romantic ballet in Ru...
   Found op http://www.infoplease.com/ce6/people/A0825708.html
   
   

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