@article {3004,
	title = {Die Gattung Helvella {\textemdash} Morphologie und Taxonomie},
	journal = {Beihefte zur Zeitschrift f{\"u}r Mykologie},
	volume = {7},
	year = {1987},
	pages = {1-165},
	url = {http://www.dgfm-ev.de/category/hauptmen\%C3\%BC/publikationen/artikelarchiv},
	author = {H{\"a}ffner, J.}
}
@article {3003,
	title = {The genus Helvella in Alberta},
	journal = {Mycotaxon},
	volume = {33},
	year = {1988},
	pages = {229-250},
	author = {Abbott, S.P. and Currah, R.S.}
}
@article {3002,
	title = {Studies on cupulate species of Helvella},
	journal = {Karstenia},
	volume = {19},
	year = {1979},
	pages = {33-45},
	author = {Harmaja, H.}
}
@article {3001,
	title = {A revision of the Helvella acetabulum group (Pezizales) in Fennoscandia},
	journal = {Karstenia},
	volume = {17},
	year = {1977},
	pages = {45-58},
	author = {Harmaja, H.}
}
@article {3000,
	title = {The Helvella lacunosa species complex in western North America: cryptic species, misapplied names and parasites},
	journal = {Mycologia},
	volume = {105},
	year = {2013},
	pages = {1275-1286},
	issn = {0027-5514},
	doi = {10.3852/12-391},
	url = {http://www.mycologia.org/cgi/doi/10.3852/12-391},
	author = {Nguyen, N.H. and Landeros, F. and Garibay-Orijel, R. and Hansen, K. and Vellinga, E.C.}
}
@article {2998,
	title = {Notes sur le genre Helvella L. (Ascomycota, Pezizales). 1. Le sous-genre Elasticae},
	journal = {Bulletin trimestriel de la F{\'e}d{\'e}ration mycologique et botanique de Dauphin{\'e}-Savoie},
	volume = {199},
	year = {2010},
	pages = {27-60},
	author = {van Vooren, N.}
}
@article {2997,
	title = {The genus Helvella in Europe, with special emphasis on the species found in Norden},
	journal = {Dansk Botanisk Arkiv},
	volume = {25},
	year = {1966},
	pages = {1-171},
	url = {http://www.ascomycete.org/Portals/0/PDF/Dissing001.pdf},
	author = {Dissing, H.}
}
