Introduction : The problem of the Problematica = Introduction : Le problème des ProblematicaBENGTSON, S.Problematica fossil taxa. 1986, pp 3-11Book Chapter

Precambrian carbonaceous megafossils = Les mégafossiles carbonacés antécambriensHOFMANN, H.J.International symposium on fossil algae. 3. 1985, pp 20-33Conference Paper

Extant Problematica within or near the MetazoaHASZPRUNAR, G; RIEGER, R.M; SCHUCHERT, P et al.The early evolution of Metazoa and the significance of problematic taxa. 1991, pp 99-105Conference Paper

Considerations on systematic placement of the Styliolines (Incertae Sedis : Devonian) = Sur la position systématique des styliolines (Incertae Sedis : Dévonien)YOCHELSON, E.L; LINDEMANN, R.H.Problematica fossil taxa. 1986, pp 45-58Book Chapter

Problematica of the Early Cambrian = Problematica du Cambrien inférieurROZANOV, A.YU.Problematica fossil taxa. 1986, pp 87-96Book Chapter

Skeletnye problematichnye organizmyGRIGOR'EVA, N. V.Trudy Instituta geologii i geofiziki (Novosibirsk). 1983, Num 558, pp 155-169, issn 0568-658XArticle

Discussion of precambrian metazoans = Discussion à propos des Métazoaires du PrécambrienSEILACHER, A.Philosophical transactions of the Royal Society of London. Series B, Biological sciences. 1985, Vol 311, Num 1148, pp 47-48, issn 0080-4622Article

Discussion sur les «méduses fossiles» du groupe Wuhangshan, Précambrien supérieur, péninsule de Liaodong, ChineCHEN MENG'E.Dìzhì kexué. 1984, Num 1, pp 51-57, issn 0563-5020Article

Problematica/Incertae sedisYOCHELSON, E.L.The early evolution of Metazoa and the significance of problematic taxa. 1991, pp 287-296Conference Paper

Prochie skeletnye problematikiGRIGOR'EVA, N. V; ZHURAVLEVA, I. T.Trudy Instituta geologii i geofiziki (Novosibirsk). 1983, Num 558, pp 166-169, issn 0568-658XArticle

THE INORGANIC ORIGIN OF "ANELLOTUBULATES" = L'ORIGINE INORGANIQUE "D'ANELLOTUBULATES"PICKETT J; SCHEIBNEROVA V.1974; MICROPALEONTOLOGY; ISSN 0026-2803; USA; DA. 1974; VOL. 20; NO 1; PP. 97-102; BIBL. 5 REF.Article

TECHNIQUE DE REGONFLEMENT DES MICROORGANISMES FOSSILES CONTENANT DES SCLEROPROTEINESLOCQUIN MV.1981; CAH. MICROPALEONTOL.; ISSN 0068-5054; FRA; DA. 1981; NO 1; PP. 57-58; ABS. ENG; BIBL. 1 REF.Conference Paper

CHEMOTAXONOMY OF SOME PROBLEMATIC PALAEOZOIC PLANTS.NIKLAS KJ; CHALONER WG.1976; REV. PALAEOBOT. PALYNOL.; NETHERL.; DA. 1976; VOL. 22; NO 2; PP. 81-104; BIBL. 2 P. 1/2Article

SYNONYMY OF THE ICHNOGENUS LINGULICHNITES SZMUC, OSGOOD & MEINKE, 1976, WITH LINGULICHNUS HAKES 1976.SZMUC EJ; OSGOOD RG; MEINKE DW et al.1977; LETHAIA; NORVEGE; DA. 1977; VOL. 10; NO 2; PP. 106; BIBL. 2 REF.Article

LIFE IN THE PRECAMBRIANFORD TD.1980; NATURE; GBR; DA. 1980; VOL. 285; NO 5762; PP. 193-194Article

Novoe semejstvo iskopaemykh kolyucheperykh rybBANNIKOV, A. F; FEDOTOV, V. F.Doklady Akademii nauk SSSR. 1984, Vol 276, Num 3, pp 708-710, issn 0002-3264Article

Découverte et importance de petits fossiles à coquilles du Cambrien inférieur dans la région d'Hexi, Xixiang, ShaanxiLI ZHONG-PING.1984, Vol 2, pp 73-78Article

Trubchatye problematikiTrudy Instituta geologii i geofiziki (Novosibirsk). 1983, Num 558, pp 159-162, issn 0568-658XArticle

Ein Problematikum (Elytromorpha robusta n. gen. n. sp.) aus dem unteren Buntsandstein von Mitteleuropa = Un fossile problématique (Elytromorpha robusta n. gen. n. sp.) du Buntsandstein inférieur d'Europe centraleMÜLLER, A. H.Freiberger Forschungshefte. Reihe C. 1982, Num 366, pp 85-88, issn 0071-9404Article

Filicales, Pteridospermae, Cycadales, incertae sedis. II: SupplementDIJKSTRA, S. J; VAN AMEROM, H. W. J.Fossilium catalogus. II. Plantae. 1985, pp 461-619, issn 0167-7802, pars 91Serial Issue

AulofikusASTASHKIN, V. A.Trudy Instituta geologii i geofiziki (Novosibirsk). 1983, Num 558, pp 176-177, issn 0568-658XArticle

Vend UkrainyVELIKANOV, V. A; ASEEVA, E. A; FEDONKIN, M. A et al.1983, 161 p.Book

On paracarinachitidsQIAN YIAN-LIAN.1993, Vol 10, Num 3, pp 317-331, issn 1000-0674Article

The early evolution of Metazoa and the significance of problematic taxa. Proceedings of an international symposium held at the University of Camerino; 27-31 March 1989SIMONETTA, Alberto M; CONWAY MORRIS, Simon.The early evolution of Metazoa and the significance of problematic taxa. 1991, pp IX-296, isbn 0-521-40242-5, p, isbn 0-521-40242-5Conference Proceedings

Precambrian problematica animals : Their body plan and phylogeny = Animaux problématiques précambriens : Symétrie et phylogénieFEDONKIN, M.A.Problematica fossil taxa. 1986, pp 59-67Book Chapter