共 28 条
[1]
BAXTER RW, 1978, PALAEONTOGRAPHICA B, V165, P79
[2]
Bierhorst DW., 1971, MORPHOLOGY VASCULAR
[5]
EGGERT DONALD ALAN, 1961, PALAEONTOGRAPHICA, V108, P43
[6]
FRANKENBERG JM, 1968, THESIS U ILLINOIS
[7]
Frankenberg JM, 1969, PALAEONTOGR ABT B, V128, P1
[8]
FRY WL, 1956, J PALEONTOL, V30, P35
[9]
Jennings J.R., 1975, PALAEONTOLOGY, V18, P19
[10]
JOY K. W., 1956, ANN BOT, V20, P635