1. Real Siamese twins;Anonymous;The Aquarium,1951
2. “Siamesische Zwillinge” beim “Kleinen Maulbrüter”;Bath;Aqu. Terr. Z.,1956
3. Hermaphroditism in Fundulus heteroclitus;Chidester;Anat. Rec.,1917
4. “Diseases of Fishes”;Duijn,1956
5. Complete sex-reversal in the viviparous teleost Xiphophorus helleri;Essenberg;Biol. Bull., Woods Hole,1923