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

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

ZOOPHYCOS: ICHNOFOSSILE DE LA FORMATION ARITA A YUASA CHO PREFECTURE DE WAKAYAMA, JAPONKANSHA Y.1974; J. GEOL. SOC. JAP.; JAP.; 1974, VOL. 80, NUM. 0008, P. 381 A 382Serial Issue

MICROFOSSILES PROBABLES DANS LES LENTILLES DE CHARBON DE PHYLLITES A ORIVESI.LAHTI S.1971; GEOLOGI; FIN; 1971, VOL. 23, NUM. 0007, P. 85 A 87Miscellaneous

RESTES ORGANIQUES PROBLEMATIQUES DANS LES GRES DES FORMATIONS DE TOGUZAK ET AYAT DE TRANSOURALIE MERIDIONALE.MAMAEV NF.1970; TRUDY. INST. GEOL. GEOKHIM., SVERDLOVSK, S.S.S.R.; 1970, NUM. 0087, P. 67 A 72Miscellaneous

UEBER DEN FEINBAU DER ZYSTENWANDUNG VON PACHYSPHAERA MARSHALLIAE PARKE, 1966. (LA STRUCTURE FINE DE LA PAROI DES CYSTES DE PACHISPHAERA MARSHALLIAE PARKE, 1966).JUX U.1969; PALAEONTOGRAPHICA B; DEU; 1969(4), VOL. 125, P. 104 A 111Miscellaneous

NOUVELLES DONNEES SUR LA PALEONTOLOGIE DU PRECAMBRIEN.VOLOGDIN AG.1969; VEST. AKAD. NAUK S.S.S.R.; SUN; 1969(10), VOL. 39, NUM. 0010, P. 23 A 34Miscellaneous

A MICROPROBLEMATICUM FROM THE PALEOCENE OF SURINAM.HUGHES CLARKE MW.1969; GEOL. EN MIJNBOUW; NLD; 1969(4), VOL. 48, NUM. 0002, P. 181 A 183Miscellaneous

ON SOME PROBLEMATIC ORGANIC TRACES FROM THE FLYSCH OF THE POLISH CARPATHIANS (PART 3).KSIAZKIEWICZ M.1968; ROCZ. POLSK. TOW. GEOL; POL; 1968, VOL. 38, NUM. 0001, P. 3 A 18Miscellaneous

TRACE FOSSILS FROM THE PERMIAN POLARSTAR FORMATION, SENTINEL MOUNTAINS, ANTARCTICA.TASH P.1968; TRANS. KANSAS ACAD. SCI.; USA; 1968(8), VOL. 71, NUM. 0002, P. 184 A 194Miscellaneous

RASTOS DO GRUPO DOS BILOBITES DA FORMACAO IRATI,SAO PAULO.KEGEL W.1967; MINIST. MINAS ENERG., DIV. GEOL. MINERAL., NOTAS PRELIMINARES ESTUD.; BRA; 1967, NUM. 0136, P. 3 A 9Miscellaneous

OBSERVATIONS A LA NOTE DE MM. GARDET, LAUGIER ET LESSERTISSEUR.MAUBEUGE PL.1957; C.R. SOC. GEOL. FR; FRA; 1957, NUM. 0013, P. 268Miscellaneous

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