Reproductive health care
international symposium, oct. 10-15, 1982
Research on the regulation of human fertility (1+2)
Needs of developing countries and priorities for the future
Rhythm calculator
Patent 2513196
Rhythm clock
Patent 3.472.018
Rhythmic cycle calculator
Patent 2.532.819
Rhythmic cycle calendar
Patent 2.161.345
Rhythmic cycle indicator
