View Patent / 1975 Doxycycline alkali metal polyphosphate complex with improved pharmacological properties GB 1463726
View Patent / 1974 Biological transformation of anhydrotetracyclines to 6-deoxytetracyclines FR 2187301
View Patent / 1973 16.beta.-Methyl-17.alpha.-hydroxypregna-1,4,9(11)-triene-3,20-dione and analogs GB 1397267