no. 2
The behaviour of parsing time under grammar morphisms
RAIRO. Informatique théorique, Tome 12 (1978) no. 2, pp. 83-97. 
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     volume = {12},
     number = {2},
     year = {1978},
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     zbl = {0384.68074},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1978__12_2_83_0/}
}
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Walter, Hermann K.-G.; Keklikoglou, Joannis; Kern, Werner. The behaviour of parsing time under grammar morphisms. RAIRO. Informatique théorique, Tome 12 (1978) no. 2, pp. 83-97. http://www.numdam.org/item/ITA_1978__12_2_83_0/

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