3. Operace
Algebra, každý začátek je lehký, GDML_Books, (1986), p. 89-125 / Harvested from
Access to full text
Full (PDF) 
@inbook{404147,
     title = {3. Operace},
     booktitle = {Algebra, ka\v zd\'y za\v c\'atek je lehk\'y},
     series = {GDML\_Books},
     publisher = {Mlad\'a fronta},
     address = {Praha},
     year = {1986},
     pages = {89-125},
     url = {http://dml.mathdoc.fr/item/404147}
}

 (éd.). 3. Operace, dans Algebra, každý začátek je lehký, GDML_Books,  (1986), pp. 89-125. http://gdmltest.u-ga.fr/item/404147/