Having travelled extensively on business to Sweden in the 70's and then lived there for most of the 80s, I'm very familiar with Swedish aquavit - I can't give you a www reference as they all refer to just the inclusion of caraway seeds as flavouring, - that may well be the case, but the whole point of aquavit is that a whole range of different herbs are used to flavour the very many different Swedish (and Norwegian and Danish) regional varieties.
One of the perfect combinations that I have had the great guid fortune to come across during my life is the Swedish dish of Baltic herring, - there are various optional and different possible accompaniments, - but the one essential such is a glass of ice-cold aquavit, - my Swedish favourite is the version from the southern province of Skåne, but in Norway I'd go for Linje, in Denmark for Aalborg, but in Finland for Koskenkorva vodka!, - see
http://everything2.com/index.pl?node=aquavit for a brief aquavit summary

. Be aware that, depending on the herbs used for flavouring, the method of maturing the spirit, the age, the taste can vary very widely.
An optional extra is a chaser of a traditional "German style" top brewed lager .......... the most widely produced style of lager in Scandinavia.
In the 70s when I was travelling regularly to Sweden, the agent of the company for which I worked very soon sussed out my great delight at the combination of Baltic herring and Skåne aquavit.
On subsequent visits to the UK, he then brought with him as a present a bottle of Skåne aquavit.
Great, but what do you then do with that in the UK?

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Baltic herring is not that easy to obtain, - there used to be a Danish company in the UK that supplied Scandinavian foodstuffs, but it cost an arm and a leg

, and we're just not set up in the UK to serve a spirit such as aquavit ice-cold, - this requires little dishes into which is placed crushed ice in which the teeny-weeny aquavit glass sits, since, please believe me, you don't really want to taste aquavit at room temperature
Placing a bottle of aquavit in the freezer, BTW, involves an unfortunate chemical reaction involving the separation of various components, resulting in a horribly cloudy spirit that is no longer aquavit!!
So what to do

, given the ever increasing number of unused bottles of Skåne aquavit in the Webster household, - it just wasn't socially acceptable to tell the Swedish agent that the gift was problematic
A wee bit of experimentation solved the problem, but it took some effort, since the required investigation revealed that all but one mixer didn't work, but I can guarantee you that the combination of Skåne aquavit and bitter lemon mixer is quite superb
David