Hřebabecký, Hubert: Synthesis of 1-(3-azido-2,3-dideoxy-4-C-hydroxymethyl-alpha-L-threo-pentofuranosyl)thymine, 1-(2,3-dideoxy-4-C-hydroxymethyl-alpha-L-glycero-pentofuranosyl)thymine and 1-(2,3-dideoxy-4-C-hydroxymethyl-alpha-L-glycero-pen|t-2-enofuranosyl)thymine