1. Enraf-Nonius, Structure Determination Package SDP-PLUS version 1.0, Delft 1982
2. , , , , , : MULTAN 11/82. A System of Computer Programs for the Automatic Solution of Crystal Structures from X-ray Diffraction Data. Univ. of York, England, and Louvain, Belgium 1982
3. 6,7-endo-Epoxy-2-oxabicyclo[3.3.0]octan-3-one