after 1990

Viehmann I., 1990  Actiunea factorilor geologici fizico-geografici in procesele de morfogeneza a lapiezurilor, Bulet.  Speol. CSER " Pestera", nr. 3, p. 138-141

Viehmann I., Kovacs H., 1990  Noi observatii asupra impactului om-pestera, Bulet. speol. CSER - Cluj, "Pestera",  nr. 3, p. 138-141

Viehmann I., 1990  Morfogeneza marmitelor, observatii si experiente efectuate in carstul din Muntii Padurea
Craiului, Bult. Speol. CSER - Cluj "Pestera", nr. 3, p. 54-69

Viehmann, I., 1991  Geneza tavanului plan-orizontal in pesteri, Simp. Nat. de Carstologie teor. si aplic, IX, Baile Herculane, rezum. p. 4

Viehmann, I., 1991  Eisiesenwelt si Scarisoara, Pro Natura, Vatra Romineasca, Nr. 11, Cluj, p. 16

Rakosi L., Viehmann, I., 1991  Cheile Turului, Ocrotirea Naturii, nr. 35, Bucuresti, p. 15

Viehmann, I., 1992  Experimental methods in studying the cave rafts, Theoretical and Appl. Kartsology, vol. 5, Ed. Acad. Bucuresti, p. 213

Viehmann, I., Ghergari L., Onac, B. 1997  Crystalogrphycal observation on calcite rafts. Proced. of the 12-th Internat. Congr. of Speleol., vol. 1, La Chaux de Fonds, p. 227-230

Viehmann,I. 1997  Sur les relations entre l'homme et l'ours des cavernes. Proced. 12-th Internat. Congr. Speleo vol. 2, La Chaux de Fonds, p. 133-135

Viehmann, I., Munteanu C., Salanta M., 1998  Grottes d'origines tectonique, Livre au Colloc. "Karts & tectonique, "Universite deMons", p. 185-187

Viehmann, I., Lauritzen St. E., Onac, B., 2000  The Virtop cave man, Realizari si perspective in studiul Cuaternarului din Romania, Presa Universitara Clujeana, p.  7

Viehmann, I. 2000  The esthetic value of karst, The XVIII-th Symp. Geomorf., Sighetul Marmatiei, rezumat, p.1

Viehmann, I. 2000  Prezenta omului de caverna in pesterile Rominiei (Abstract), Simp. Realizari si perspective in studiul Cuaternarului din Romania, Presa Univ. Clujeana, p. 1

Viehmann, I. 2000  Comparativ morphological studies on a collection of 100 cave pearls, Karst studies and Problems: 2000 and Beyond Proceedings, Presa Univ. Clujeana

Viehmann, I. 2000  Un experience ecologique oculte, Karts Studies and Problems: 2000 and Beyond Proceedings, Presa Univ. Clujeana 5 p.

Viehmann, I. 2000  Padis - Cetatile Ponorului, Karts landform and caves of Bihor (Guidebook), 3p.

Viehmann, I. 2000  Ecologia agresiunii umane, Univ. "Bogdan-Voda", Baia Mare, Ed. Risoprint, 4p.

Viehmann, I. 2000  Muntele si medul ostil, Univ. "Bogdan-Voda", Baia Mare, Ed. Risoprint, 5p.

Viehmann, I. 2000  For an ecology of hostile environement, Evolution and adaptation, T 6/2000, Presa Univ. Clujeana

Viehmann, I. 2000  Curs de speologie, Presa Univ. Clujeana, 197 p.

Onac, B. P., White, W.B., I. Viehmann, 2001  Leonite, konyaite and synegite from Tausoare cave, Rodnei Mts., Romania, Mineralogical Magasine, Vol. 65 (1), 7 p.