Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 20 references without a DOI — listed, not checked
no DOI — not checked?, 1987: A rapid DNA isolation method for small quantities of fresh tissues. ? Phytochem. Bull.19: 11?15.
no DOI — not checkedGielly, L., 1994: ADN chloroplastique et phylogénies intragénériques. ? Ph.D. Thesis, Université Joseph Fourier, Grenoble.
no DOI — not checked?, 1994: The use of chloroplast DNA to resolve plant phylogenies: noncoding versus rbcL sequences. ? Mol. Biol. Evol.11: 769?777.
no DOI — not checkedGilg, E., 1895:Gentianaceae. ? InEngler, A., Prantl, K., (Eds): Die natürlichen Pflanzenfamilien4(2), pp. 50?62. ? Leipzig: Engelmann.
no DOI — not checkedHiggins, D. G., Bleasby, A. J., Fuchs, R., 1992: CLUSTAL:A new multiple sequence alignment program. ? Comp. Appl. Biosci.8: 189?191.
no DOI — not checkedHo, T. N., 1988:Gentianaceae. ? InHo, T. N., (Ed.): Flora Reipublicae Popularis Sinicae62. ? Beijing: Science Press.
no DOI — not checked?, 1990: The infrageneric classification ofGentiana (Gentianaceae). ? Bull. British Mus. Nat. Hist., Bot.,20: 169?192.
no DOI — not checkedIltis, H. H., 1965: The genusGentianopsis (Gentianaceae): transfer and phytogeographic comments. ? Sida2: 129?154.
no DOI — not checkedLöve, A., Löve, D., 1975: The Spanish gentians. ? Anal. Inst. Bot. Cavanilles32: 221?232.
no DOI — not checked- - 1976: The natural genera ofGentianaceae. ? InKachroo, P., (Ed.): Recent advances in botany, Prof.P. N. Mehra commemorative volume, pp. 205?222. ? Dehra Dun.
no DOI — not checkedMarquand, C. V. B., 1931: New Asiatic gentians: II. ? Bull. Misc. Inf. Roy. Bot. Gard. Kew1931: 68?88.
no DOI — not checked?, 1937: The gentians of China. ? Bull. Misc. Int. Roy. Bot. Gard. Kew1937: 134?180.
no DOI — not checkedPringle, J. S., 1978: Sectional and subgeneric names inGentiana (Gentianaceae). ? Sida7: 232?247.
no DOI — not checkedSmith, H., 1965: Notes onGentianaceae. ? Notes Roy. Bot. Gard. Edinburgh26(2: 237?258.
no DOI — not checked?, 1970: ? InNilsson, S.,: Pollen morphological studies in theGentianaceae. ? Acta Univ. Upsaliensis, Abstr. Uppsala Dissert. Sci.165: 5?18.
no DOI — not checkedSwofford, D. L., 1991: PAUP: phylogenetic analysis using parsimony, version 3.0s. ? Computer software. ? Champaign, Il.: Illinois Natural History Survey.
no DOI — not checkedToyokuni, H., 1963: Conspectus Gentianacearum Japonicarum, a general view of theGentianaceae indigenous to Japan. ? J. Fac. Sci. Hokkaido Univ., Ser. V,7(4: 137?259.
no DOI — not checked?, 1965: Systema gentianinarium novissimum ? facts and speculation relating to the phylogeny ofGentiana, sensu lato and related genera. ? Symb. Asahikawensis1: 147?158.
no DOI — not checkedTutin, T. G., 1972:Gentiana. ? InTutin, T. G. & al., (Eds): Flora Europaea3: 59?63. ? Cambridge: Cambridge University Press.
no DOI — not checked?, 1993b: Karyological studies onGentiana sect.Frigida s. l. and sect.Stenogyne (Gentianaceae) from China. ? Bull. Soc. Neuchâtel. Sci. Nat.116(2: 65?78.
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