Zona drilling and sperm insertion with combined laser microbeam and optical tweezers**Presented in part at the IXth Annual Meeting of the European Society of Human Reproduction and Embryology, Thessaloniki, Greece, June 27 to 30, 1993.

1994 ◽  
Vol 61 (4) ◽  
pp. 783-786 ◽  
Author(s):  
Karin Schütze ◽  
Annette Clement-Sengewald ◽  
Arthur Ashkin
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