HPLC analysis of flavonoids and phenolic acids and aldehydes in Eucalyptus spp. E. Conde, E. Cadahía and M. C. Garcia-Vallejo, Chromatographia, Volume 41, Numbers 11-12, 657-660, doi:10.1007/BF02267800
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Ex25 in GB 879259, "Acid addition salts of 2-dimethylaminoethanol and central nervous system stimulant compositions containing them", published 1961-10-11, assigned to Riker Laboratories Inc.
ES 456989, Sanjosé, Miguel Izquierdo & Ulpiano Martín-Escudero, Pérez, "Procedimiento de obtencion de un derivado de 4-aminopiridina y sus sales [Procedure for obtaining a 4-aminopyridine derivative and its salts]", published 1978-07-16, assigned to Laboratorio Farmaceutico Quimico-Lafarquim SA