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

PRECAMBRIAN FOSSILS, PSEUDOFOSSILS, AND PROBLEMATICA IN CANADA.1971; GEOL. SURV. CANADA, BULL.; CAN; 1971, NUM. 0189, P. 1 A 146Miscellaneous

Remarques sur l'ultrastructure et les affinités bilogiques des Lithraphidites, Nannofossiles calcaires du Crétacé = Remarks on ultrastructure and biological affinities of Lithraphidites, cretaceous calcareous nannofossilsJANIN, M.-C.Revue de Micropaléontologie. 1998, Vol 41, Num 4, pp 281-296, issn 0035-1598Article

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

DEBRIS CUTICULAIRES D'ANNELIDES ASSOCIES AUX SCOLECODONTESTAUGOURDEAU P.1972; REV. PALAEOBOT. PALYNOL.; NETHERL.; 1972, VOL. 13, NUM. 0003-0004, P. 233 A 252Serial Issue

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

L'énigme des Microcodium = The Microcodium enigmaBIGNOT, G.Bulletin trimestriel de la Société géologique de Normandie et des amis du Muséum du Havre. 1994, Vol 81, Num 2, pp 25-45, issn 0336-9994Article

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

QUELQUES REMARQUES SUR LES ORGANISMES INCERTAE SEDIS DE LA FAMILLE DES CALCISPHAERULIDAE BONET.DUFOUR T.1968; C.R. ACAD SCI., D; FRA; 1968(5), VOL. 266, NUM. 0019, P. 1947 A 1949Miscellaneous

The Cambrian netlike fossil Microdictyon = Le fossile réticulé cambrien MicrodyctionBENGTSON, S; MATTHEWS, S.C; MISSARZHEVSKY, V.V et al.Problematica fossil taxa. 1986, pp 97-115Book Chapter

PROBLEMATICAL FOSSILS FROM THE PERMIAN LIMESTONE OF AKASAKA,GIFU PREFECTURE.OZAKI K.1968; SCI. REP., YOKOHAMA UNIV., JAP; JPN; 1968, NUM. 0014, P. 27 A 33Miscellaneous

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

NUEVOS DATOS SOBRE GLOBOCHAETE ALPINA. = NOUVELLES DONNEES SUR GLOBOCHAETE ALPINATELLEZ GIRON C; TREJO M.1974; REV. INST. MEX. PETROLEO; MEX; 1974, VOL. 6, NUM. 0001, P. 98 A 103Serial Issue

Parathuramminines et Moravamminides (Foraminifères ?) du Givétien du Maroc central = Parathurammina and Moravamminida (Foraminifera ?) from the Givetian of Central MoroccoVACHARD, D; ZAHRAOUI, M; CAETTANO, G et al.Revue de paléobiologie. 1995, Vol 14, Num 1, pp 1-19, issn 0253-6730, 19 p.Article

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

Homologies in Cambrian Onychophora = Homologies chez les Onychophores cambriensRAMSKÖLD, L.Lethaia (Oslo. Trykt utg.). 1992, Vol 25, Num 4, pp 443-460, issn 0024-1164Article

Luolishania gen. nov. : Un animal marin intermédiaire entre arthropode et annélidé du Cambrien inférieur de Chengjiang dans le YunnanHOU XIAN-GUANG; CHEN JUN-YUAN.Gǔshēngwùxué bào. 1989, Vol 28, Num 2, pp 207-213, issn 0001-6616Article

Présence de microfossiles dans le Membre Yangjiagou de la Formation Tongying, Shaanxi méridionalQIN HONG-BIN; DING LIAN-FANG.1988, Vol 5, Num 2, pp 171-178Article

El genero Polyderma y nuevas soluciones a la sistematica de las calcisferas, microfosiles problematicos del Paleozoico = le genre Polyderma et solutions nouvelles à la systématique des calcisphères, microfossiles problématiques du PaléozoïqueVACHARD, D; TELLEZ-GIRON, C.Revista del Instituto Mexicano del Petroleo. 1986, Vol 18, Num 3, pp 6-31, issn 0538-1428Article

NOTES ON THE MORPHILOGY AND TAXONOMIC POSITION OF AYSHEAIA (ONYCOPHORA.) AND OF SKANIA (UNDETERMINED PHYLUM).DELLE CAVE L; SIMONETTA AM.1975; MONIT. ZOOL. ITAL.; ITAL.; 1975, VOL. 9, NUM. 0002, P. 67 A 81Serial Issue

OCCURRENCE OF KECKIA ANNULATA GLOCKER, IN THE BAGH BEDS OF NARMADA VALLEY.CHIPLONKAR GW; GHARE MA.1975; CURR. SCI.; INDIA; 1975, VOL. 44, NUM. 0016, P. 583 A 584Serial Issue