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  1. By: Kiew, Ruth - Welzen, P. C. van
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 50
    Series: 4
    Date: 1998
    Page Range: 31--34
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  2. By: Roos, M C - Berendsohn, Walter G., - Dessein, Steven - Hamann, T - Hoffmann, N - Hovenkamp, P - Janssen, T - Kirkup, D - De Kok, R. P. J. (Rogier P. J.) - Sierra, S E C - Smets, E - Webb, Campbell - Welzen, P. C. van
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 63
    Series: 4
    Date: 2011
    Page Range: 189--195
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  3. By: Welzen, P. C. van - Raes, Niels
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 63
    Series: 4
    Date: 2011
    Page Range: 329--339
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  4. By: Welzen, P. C. van
    Type: Article
    In: Austrobaileya: A Journal of Plant Systematics
    Volume: 5
    Issue: 1
    Date: 1997
    Page Range: 103--105
    Publication Info: Brisbane Queensland Herbarium, Dept. of Primary Industries
  5. By: Slik, J W F - Priyono - Welzen, P. C. van
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 52
    Series: 4
    Date: 2000
    Page Range: 11--88
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  6. By: Wilkin, Paul - Suksathan, Piyakaset - Keeratikiat, Kaweesak - Welzen, P. C. van - Wiland-Szymańska, Justyna
    Type: Article
    In: PhytoKeys
    Volume: 26
    Date: 2013
    Page Range: 101-112
    Publication Info: Pensoft Publishers 2013
  7. By: Beveridge, Nils G. P. - Rauch, Cessa - Ke, Paul J A - Szlig - Ler - Vugt, Rogier van - Welzen, P. C. van
    Type: Article
    In: Carnivorous plant newsletter
    Volume: 42
    Issue: 4
    Date: 2013
    Page Range: 122--128
    Publication Info: Fullerton, CA, etc International Carnivorous Plant Society, etc
  8. By: Welzen, P. C. van - Winkel, Esmée - Bouman, Roderick
    Type: Article
    In: PhytoKeys
    Volume: 225
    Date: 2023
    Page Range: 165-198
    Publication Info: Pensoft Publishers 2023
  9. By: Welzen, P. C. van - Stuppy, Wolfgang
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 86
    Date: 1999
    Page Range: 894--903
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  10. By: Kartonegoro, Abdulrokhman - Veldkamp, Jan-Frits, - Hovenkamp, Peter - Welzen, P. C. van
    Type: Article
    In: PhytoKeys
    Volume: 107
    Date: 2018
    Page Range: 1-178
    Publication Info: Pensoft Publishers 2018