//=preg_replace('/[^a-z0-9]/', '', strtolower($formats[0]))?>//=$formats[0] ?>
Heterocyclic Chemistry by: Joule, J. A., et al. Published: (1996)
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Handbook of Heterocyclic Chemistry by: Katritzky, Alan R., 1928-2014 Published: (1985)
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Proč probíhají chemické reakce? by: Campbell, J. Arthur 1916-1989 Published: (1972)