GERSON, Elizabeth A. - KELSEY, Rick G. Foliar storage and extraction methods for quantitative analysis of piperidine alkaloids from ponderosa pine (Pinus ponderosa). In Phytochemical Analysis. - Chichester : John Wiley * Sons, 1999, vol. 10, s. 322-327Error: read handle in (rep.epca.fmtISO690).fmtXDatabaze.