1. The VO2max of recreational athletes before and after pregnancy
2. The electronic evaluation of fetal heart rate
3. Stembera ZK, Hodr J: The “exercise test” as early diagnostic aid for fetal distress, in Horsky J, Stembera ZK (eds): Intrauterine Dangers to the Fetus. New York City, Exerpta Medica Foundation, 1967
4. Pokorny J, Rous J: The effect of mother's work on fetal heart sounds, in Horsky J, Stembera ZK (eds): Intrauterine Dangers to the Fetus. New York City, Exerpta Medica Foundation, 1967