1. Bennet, H.S., Luft, J.H., Hampton, J.C.: Morphological classifications of vertebrate blood capillaries. Am. J. Physiol.196, 381?390 (1959)
2. Comolli, A., Ferraguti, M.: An unusual obliquely striated muscle pattern: the myoendothelial cell of the blood vessels of Tubificidae (Annelida Oligochaeta). Monitore Zool. Ital.9, 25?36 (1975)
3. Cori, C.J.: Untersuchungen über die Anatomie und Histologie der GattungPhoronis. Z. wiss. Zool.51, 480?568 (1890)
4. Cori, C.J.: Phoronidea. Bronn's Kl. Ordn. Tierreichs4 (4), 1?183 (1939)
5. Emig, C.C.: Ultrastructure du tube digestif dePhoronis psammophila Cori. I. Estomac (cellules ciliées). Arch. Zool. exp. gen.108, 617?632 (1967)