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Cafruni, A.M.S. 1983. Autoecologia de Ruppia maritima no
     estuario da Lagoa dos Patos. M.S. thesis, University Rio
     Grande, Brazil. 64 pp. (not seen).

Cox, P.A., and R. B. Knox. 1989. Two-dimensional pollination in
     hydrophilous plants: convergent evolution in the genera
     Halodule (Cymodoceaceae), Halophila
     (Hydrocharitaceae), Ruppia (Ruppiacae), and
     Lepilaena (Zannichelliaceae). Am. J. Bot. 76:164-175.

Dawe, N.K., and E.R. White. 1982. Some aspects of the vegetation
     ecology of the Little Qualicum River estuary, British
     Columbia. Can. J. Bot. 60:1447-1460.

Gamerro, V.C. 1968. Observaciones sobre la biologia floral y
     morfoligia de la Potamogetonacea Ruppia cerrhosa
     (Petag.) Grande (= R. spiralis L. Ex. Dum.).
     Dawinia 14:57-68. (Not seen)

Jacobsen, H.A., and G.L. Jacobson, Jr. 1989. Variability of
     vegetation in tidal marshes of Maine, U.S.A. Can. J. Bot.
     67:230-238.

Jepsen, P.U. 1970. Vegetationsaendringer i Hjarbaek Fjord i
     perioden 1967-1969. Flora og Fauna 76:99-108.

Kautsky, L. 1990. Seed and tuberbanks of auquatic macrophytes in
     the Asko area, northern Baltic proper. Holarctic Ecol.
     13:143-148.

Kautsky, L. 1991. In situ experiments on interrelationships
     between six brackish macrophyte species. Aquat. Biol.
     39:159-172.

Knak, R.B. 1986. Ecologia experimental de Ruppia
     maritima L en condicoes controladas de cultivo. M.S.
     thesis, University Rio Grande, Brazil. 103 pp. (not seen).

Penuelas, J., and M. Menendez. 1990. HCO-3 as an 
     exogenous carbon source for Ruppia cirrhosa (Petagna) 
     Grande. Arch. Hydrobiol. 120:89-96.