Geodesic
Spreading sequences in JT
Studia Mathematica, Tome 125 (1997) no. 1, pp. 57-66 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We prove that a normalized non-weakly null basic sequence in the James tree space JT admits a subsequence which is equivalent to the summing basis for the James space J. Consequently, every normalized basic sequence admits a spreading subsequence which is either equivalent to the unit vector basis of $l_2$ or to the summing basis for J. 
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     title = {Spreading sequences in {JT}},
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Helga Fetter;  . Spreading sequences in JT. Studia Mathematica, Tome 125 (1997) no. 1, pp. 57-66. doi: 10.4064/sm-125-1-57-66

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