The holder of a petroleum exploration concession has an investment option until the expiration date fixed by the governmental agency, in some countries these rights can be extended by additional cost. The value of these rights and the optimal investment timing are calculated by solving a stochastic optimal control problem of an American call option with extendible maturities. The uncertainty of...

Simple argument in favour of unitarity, to all orders, of space-like noncommutative field theory is given. ∗supported by the grant no. 1 P03B 021 28 of Polish Minister of Science

In the crystal structure of the title salt, C(9)H(9)N(2)O(2) (+)·Cl(-), the cations and anions are linked into chains parallel to [021] by O-H⋯Cl and N-H⋯Cl hydrogen bonds.

This paper examines Chinese and British consumers’ evaluations of Chinese, and international brands, and factors affecting their brand choice. The results support recent findings of a decline in Western brands’ preference in China. But, these are attributed to several factors. The findings show country of origin does not affect Chinese brand choice, has a great effect on British choice between ...

We report Very Large Telescope observations of 11 lensed quasars, designed to measure the redshifts of their lens galaxies. We successfully determined the redshifts for seven systems, five of which were previously unknown. The securely measured redshifts for the lensing galaxies are: HE0047−1756 z = 0.408; PMNJ0134−0931 z = 0.766; HE0230−2130 z = 0.522; HE0435−1223 z = 0.455; SDSS0924+021 z = 0...