Geodesic
π1-Semigroup
Mathematica balkanica, Tome 5 (1991) no. 3, p. 203 
Shi Mingquan. π1-Semigroup. Mathematica balkanica, Tome 5 (1991) no. 3, p. 203. http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a3/
@article{MABA_1991_5_3_a3,
     author = {Shi Mingquan},
     title = {\ensuremath{\pi}1-Semigroup},
     journal = {Mathematica balkanica},
     pages = {203},
     year = {1991},
     volume = {5},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a3/}
}
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JO  - Mathematica balkanica
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VL  - 5
IS  - 3
UR  - http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a3/
ID  - MABA_1991_5_3_a3
ER  - 
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%T π1-Semigroup
%J Mathematica balkanica
%D 1991
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