REFERENCES
- Hartwell JL. Plants used against cancer. A survey. Lloydia 1971;34:103–60.
- Duke JA. Borderline herbs. Boca Raton, Florida, USA: CRC Press 1984.
- Manjunath BL. The wealth of India – raw materials. New Delhi: Council of Scientific and Industrial Research 1948;1:75–7.
- Pakrashi A, Basak B. Abortifacient effect of steroids from Ananas comosus and their analogues on mice. J Reprod Fertil 1976;46:461–2.
- ETS. European convention for the protection of vertebrate animals used for experimental and other scientific purposes. Strasbourg: European Treaty Series, ETS-123 2005.
- Harborne JB. Phytochemical methods. A guide to modern techniques of plant analysis, 3rd. London: Chapman and Hall 1998:1–227.
- Salhab AS, Al-Tamimi SO, Gharaibeh MN, Shomaf MS. The abortifacient effects of castor bean extract and ricin A-chain in rabbit. Contraception 1998;58:193–7.
- Almeida FCG, Lemonica IP. The toxic effects of Coleus barbatus B. on the different periods of pregnancy in rats. J Ethnopharmacol 2000;73:53–60.
- Yakubu MT, Adeshina AO, Oladiji AT, . Abortifacient potential of aqueous extract of Senna alata leaves in rats. J Reprod Contracept 2010;21:163–77.
- Radwanska E, Frankenberg J, Allen EI. Plasma progesterone levels in normal and abnormal early human pregnancy. Fertil Steril 1978;30:398–402.
- Smith DH, Picker RH, Sinosich M, . Assessment of ovulation by ultrasound and estradiol levels during spontaneous and induced cycles. Fertil Steril 1980;33: 387–90.
- Ghosal S, Srivastava AK, Srivastava RS, . Justicisaponin-I, a new triterpenoid saponin from Justicia simplex. Planta Medica 1981;42:279–83.
- Hiremath SP, Badami S, Swamy HKS, . Antifertility activity of Striga orobanchioides. Biol Pharm Bull 1994;17:1029–31.
- Wang JY, Ruan, JL. Triterpenes of Marsdenia globifera (for antifertility). Chin Pharma J Zhongguo Yaoxue Zazhi 1996;31:266–9.
- Saraiya M, Berg CJ, Kendrick JS, . Cigarette smoking as a risk factor for ectopic pregnancy. Am J Obstet Gynecol 1998;178:493–8.
- Paria BC, Huet-Hodson YM, Dey SK. Blastocyst's state of activity determines the ‘window’ of implantation in the mouse receptive uterus. Proc Natl Acad Sci USA 1993;90:10159–62.