1. Alliende ME, Cabezon C, Figueroa H, Kottmann C (2005) Cervicovaginal fluid changes to detect ovulation accurately. Am J Obstet Gynecol 193:71–75
2. Barbato M, Pravettoni G (1988) Analysis of 70 cycles of simultaneous record of mucus, BBT, ultrasound and hormones. 4th European Congress of IFFLP. Institut für Ehe und Familie, Wien
3. Billings EL, Brown JB, Billings JJ, Burger HG (1972) Symptoms and hormonal changes accompanying ovulation. Lancet 1:282–284
4. Brown JB, Harrisson P, Smith MA, Burger HG (1981) Correlations between the mucus symptoms and the hormonal markers of fertility throughout reproductive life. The Ovulation Method Research and Reference Centre of Australia, Melbourne
5. Brown JB, Holmes J, Barker G (1991) Use of the home ovarian monitor in pregnancy avoidance. Am J Obstet Gynecol 165:2008–2011