Dmitri Stepanov

For publishers and scholarly societies: enquiries about access to materials, text and data mining agreements, and verification of this work are welcome at the address below. Requests are answered within two working days.

Two more things worth a letter. If a value attributed to your paper is recorded here incorrectly, write and it is corrected, with the correction kept beside the value. And if you hold ageing or charging records and want to know whether they can be compared with published values, write as well — records shared for comparison stay under the terms you set.