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	1.	No cover image available A simplified method for determination of fluorine in silicate rocks and minerals by Hetman, Johan Material type: Article; Format: print Language: Eng In: Bulletin des centres de recherches exploration-production Elf Aquitaine 1(2), 1977, p. 511-515: : ill., tab. Availability: No items available.
	2.	No cover image available Oxygen-bomb coulometric determination of vanadium in oils by Hetman, Johan Material type: Article; Format: print Language: Eng In: Bulletin du centre de recherches de Pau 5(2), 1971, p. 333-336: : graph., tab. Availability: No items available.
	3.	No cover image available Furthern studies on potentiometric titration of iron by Hetman, Johan Material type: Article; Format: print Language: Eng In: Bulletin du centre de recherches de Pau 5(2), 1971, p. 337-340: : graph., tab. Availability: No items available.

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