by Helene, C.G, Lord, K.A, Ruegg, E.F
Published in Ciência e cultura (São Paulo) (1981)

by Helene, C.G, Ruegg, E.F
Published in Revista brasileira de ciência do solo (01.09.1982)

by Helene, C.G, Buegg, E.F
Published in Revista brasileira de ciência do solo (1982)

by Helene, C.G, Cainelli, V.C.B, Ruegg, E.F
Published in Revista brasileira de ciência do solo (01.05.1983)

by Helene, C.G, Cainelli, V.C.B, Reugg, E.F
Published in Revista brasileira de ciência do solo (1983)

by Helene, C.G, Ruegg, E.F, Lord, K.A
Published in Pesquisa agropecuaria brasileira (01.02.1982)

by Helene, C.G, Ruegg, E.F, Lord, K.A
Published in Pesquisa agropecuaria brasileira (1982)

by Flores Ruegg E, Andrea M.M. de, Helene C.G, Hirata R
Published in Panel Proceedings Series (IAEA) (1980)

by Lord, K A, Helene, C G, de Andrea, M M, Ruegg, E F
Published in Arquivos do Instituto Biológico (São Paulo) (1978)

by Lord, K.A, Andrea, M.M. de, Helene, C.G, Riiegg, E.F
Published in Arquivos do Instituto Biológico (São Paulo) (01.07.1978)

by Lord K.A, Helene C.G, Andrea M.M. de, Ruegg E.F
Published in Ciência e cultura (São Paulo) (1979)