no. 2
A note on NSPACE (log 2 n) and substitution
RAIRO. Informatique théorique, Tome 11 (1977) no. 2, pp. 127-132. 
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     author = {Greibach, S. A.},
     title = {A note on {NSPACE} ($\log _2 n$) and substitution},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {127--132},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {2},
     year = {1977},
     mrnumber = {455542},
     zbl = {0359.68090},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1977__11_2_127_0/}
}
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Greibach, S. A. A note on NSPACE ($\log _2 n$) and substitution. RAIRO. Informatique théorique, Tome 11 (1977) no. 2, pp. 127-132. http://www.numdam.org/item/ITA_1977__11_2_127_0/

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